<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsAcquisitionsCostsByAcquisitionDetails" xlink:href="asgn-20130930.xsd#AcquisitionsAcquisitionsCostsByAcquisitionDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsBusinessAcquisitionProFormaInformationDetails" xlink:href="asgn-20130930.xsd#AcquisitionsBusinessAcquisitionProFormaInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsBusinessCombinationsPolicies" xlink:href="asgn-20130930.xsd#AcquisitionsBusinessCombinationsPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsScheduleOfIntangibleAssetsAcquiredAsPartOfBusinessCombinationDetails" xlink:href="asgn-20130930.xsd#AcquisitionsScheduleOfIntangibleAssetsAcquiredAsPartOfBusinessCombinationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsScheduleOfPurchasePriceAllocationDetails" xlink:href="asgn-20130930.xsd#AcquisitionsScheduleOfPurchasePriceAllocationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/AcquisitionsTables" xlink:href="asgn-20130930.xsd#AcquisitionsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/Aquisitions" xlink:href="asgn-20130930.xsd#Aquisitions" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CommitmentsAndContingencies" xlink:href="asgn-20130930.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CommitmentsAndContingenciesDetails" xlink:href="asgn-20130930.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CommitmentsAndContingenciesTables" xlink:href="asgn-20130930.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CondensedConsolidatedBalanceSheets" xlink:href="asgn-20130930.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="asgn-20130930.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="asgn-20130930.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="asgn-20130930.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeParenthetical" xlink:href="asgn-20130930.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperations" xlink:href="asgn-20130930.xsd#DiscontinuedOperationsDiscontinuedOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperationsDetails" xlink:href="asgn-20130930.xsd#DiscontinuedOperationsDiscontinuedOperationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperationsTables" xlink:href="asgn-20130930.xsd#DiscontinuedOperationsDiscontinuedOperationsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/DocumentAndEntityInformation" xlink:href="asgn-20130930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/EarningsPerShare" xlink:href="asgn-20130930.xsd#EarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/EarningsPerShareAntiDilutiveDetails" xlink:href="asgn-20130930.xsd#EarningsPerShareAntiDilutiveDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/EarningsPerShareDetails" xlink:href="asgn-20130930.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/EarningsPerShareTables" xlink:href="asgn-20130930.xsd#EarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurements" xlink:href="asgn-20130930.xsd#FairValueMeasurements" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsFairValueInputsLiabilitiesQuantitativeInformationDetails" xlink:href="asgn-20130930.xsd#FairValueMeasurementsFairValueInputsLiabilitiesQuantitativeInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDetails" xlink:href="asgn-20130930.xsd#FairValueMeasurementsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsNonrecurringBasisDetails" xlink:href="asgn-20130930.xsd#FairValueMeasurementsNonrecurringBasisDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsPolicies" xlink:href="asgn-20130930.xsd#FairValueMeasurementsPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:href="asgn-20130930.xsd#FairValueMeasurementsRecurringBasisDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FairValueMeasurementsTables" xlink:href="asgn-20130930.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/FinancialStatementPresentation" xlink:href="asgn-20130930.xsd#FinancialStatementPresentation" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/GoodwillAndIdentifiableAssets" xlink:href="asgn-20130930.xsd#GoodwillAndIdentifiableAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsAcquiredIntangibleAssetsDetails" xlink:href="asgn-20130930.xsd#GoodwillAndIdentifiableAssetsAcquiredIntangibleAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsFutureAmortizationExpenseDetails" xlink:href="asgn-20130930.xsd#GoodwillAndIdentifiableAssetsFutureAmortizationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsGoodwillDetails" xlink:href="asgn-20130930.xsd#GoodwillAndIdentifiableAssetsGoodwillDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsTables" xlink:href="asgn-20130930.xsd#GoodwillAndIdentifiableAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlan" xlink:href="asgn-20130930.xsd#IncentiveAwardPlanAndEmployeeStockPurchasePlan" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlanCompensationExpenseDetails" xlink:href="asgn-20130930.xsd#IncentiveAwardPlanAndEmployeeStockPurchasePlanCompensationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlanDetails" xlink:href="asgn-20130930.xsd#IncentiveAwardPlanAndEmployeeStockPurchasePlanDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/IncomeTaxes" xlink:href="asgn-20130930.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/IncomeTaxesDetails" xlink:href="asgn-20130930.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/LongTermDebt" xlink:href="asgn-20130930.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/LongTermDebtDetails" xlink:href="asgn-20130930.xsd#LongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/LongTermDebtTables" xlink:href="asgn-20130930.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/SegmentReporting" xlink:href="asgn-20130930.xsd#SegmentReporting" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/SegmentReportingReconciliationOfAssetsFromSegmentToConsolidatedDetails" xlink:href="asgn-20130930.xsd#SegmentReportingReconciliationOfAssetsFromSegmentToConsolidatedDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/SegmentReportingRevenueByGeographicalAreasDetails" xlink:href="asgn-20130930.xsd#SegmentReportingRevenueByGeographicalAreasDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/SegmentReportingSegmentReportingInformationDetails" xlink:href="asgn-20130930.xsd#SegmentReportingSegmentReportingInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onassignment.com/role/SegmentReportingTables" xlink:href="asgn-20130930.xsd#SegmentReportingTables" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsAcquisitionsCostsByAcquisitionDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_EFDB61E0075AC4FF35557695828AEC5D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FE2F30029000CD8A7F447695829088F5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_EFDB61E0075AC4FF35557695828AEC5D" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FE2F30029000CD8A7F447695829088F5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_E14769FE0A6FAD4BCD7A7695829022DE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FE2F30029000CD8A7F447695829088F5" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_E14769FE0A6FAD4BCD7A7695829022DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A64BFD9CBFDB86C2D2CD76958291D706" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_E14769FE0A6FAD4BCD7A7695829022DE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A64BFD9CBFDB86C2D2CD76958291D706" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSystemsMember" xlink:label="loc_asgn_ApexSystemsMember_99F325B89A8DCD6861DC769582910F57" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A64BFD9CBFDB86C2D2CD76958291D706" xlink:to="loc_asgn_ApexSystemsMember_99F325B89A8DCD6861DC769582910F57" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_FE2F30029000CD8A7F447695829088F5" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets_326C503D09CDD679E76476958291E654" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets_326C503D09CDD679E76476958291E654" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes" xlink:label="loc_asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes_22200BF32180E7EE7E45769582913335" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes_22200BF32180E7EE7E45769582913335" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:label="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_84C72FE2E40DF16BBFCE769582918324" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_84C72FE2E40DF16BBFCE769582918324" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionNameOfAcquiredEntity" xlink:label="loc_us-gaap_BusinessAcquisitionNameOfAcquiredEntity_DE2566E45C867A53304476958291A650" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionNameOfAcquiredEntity_DE2566E45C867A53304476958291A650" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionDescriptionOfAcquiredEntity" xlink:label="loc_us-gaap_BusinessAcquisitionDescriptionOfAcquiredEntity_5C835F64F1CAB039526176958291AFDE" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionDescriptionOfAcquiredEntity_5C835F64F1CAB039526176958291AFDE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationReasonForBusinessCombination" xlink:label="loc_us-gaap_BusinessCombinationReasonForBusinessCombination_EAC20DFC6149E796206B769582914E73" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessCombinationReasonForBusinessCombination_EAC20DFC6149E796206B769582914E73" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_5EA4682499410BF8F71A769582917B2D" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_5EA4682499410BF8F71A769582917B2D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_95E9AF27D0AE6E6BE09C769582915015" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_95E9AF27D0AE6E6BE09C769582915015" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6858D515DD1AD74E146D76958291B5DA" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6858D515DD1AD74E146D76958291B5DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_34B72657916F939CD38A769582910557" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_34B72657916F939CD38A769582910557" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationMethodology" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationMethodology_14FC48D50991CED3D88376958291F78D" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationMethodology_14FC48D50991CED3D88376958291F78D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus_270C02ED92544EF2328F769582910F9D" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D300FCF55B638F86CA997695829128BB" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus_270C02ED92544EF2328F769582910F9D" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsBusinessAcquisitionProFormaInformationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_3409B1F6185D04B02757063950315D5E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationAbstract" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_3409B1F6185D04B02757063950315D5E" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationDescription" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationDescription_2FB5C3ACA7BB437D62C3063950318E3F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationDescription_2FB5C3ACA7BB437D62C3063950318E3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_80235F6C8AC61DD332CD063950310068" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_80235F6C8AC61DD332CD063950310068" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_5E2C8476E0C7CA5BB0CE063950310F14" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_5E2C8476E0C7CA5BB0CE063950310F14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_AC3E0A85B3B9B1D829900639503130B8" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_AC3E0A85B3B9B1D829900639503130B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic_67364402BF03E1FC4ACA06395031EA05" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic_67364402BF03E1FC4ACA06395031EA05" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_57B367CB518B0FED6E2606395032DDB4" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_57B367CB518B0FED6E2606395032DDB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted_73B127207584A95760AB063950329ADD" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted_73B127207584A95760AB063950329ADD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_6DBEF63A415BA3EBA08C06395032F44E" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_6DBEF63A415BA3EBA08C06395032F44E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageBasicSharesOutstandingProForma" xlink:label="loc_us-gaap_WeightedAverageBasicSharesOutstandingProForma_443AE310B9A5437AD9B406395032A35E" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_WeightedAverageBasicSharesOutstandingProForma_443AE310B9A5437AD9B406395032A35E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted" xlink:label="loc_us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted_E4B9EFEF4D3CFA200453063950328B47" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_C7947138B9B9F704133C06395031ED43" xlink:to="loc_us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted_E4B9EFEF4D3CFA200453063950328B47" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsBusinessCombinationsPolicies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_FA71E94AC12AA457C6E1A8D2F3860BBF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_BA1BDC36C2345FF2205DA8D2F38624C1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_FA71E94AC12AA457C6E1A8D2F3860BBF" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_BA1BDC36C2345FF2205DA8D2F38624C1" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsScheduleOfIntangibleAssetsAcquiredAsPartOfBusinessCombinationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_FFFD78A0ED6B0B5933BEA8D2F40DB774" xlink:type="locator" />
    <loc xlink:href="asgn-20130930.xsd#asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable" xlink:label="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_FFFD78A0ED6B0B5933BEA8D2F40DB774" xlink:to="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6387CDDFA42E00F349EDA8D2F40DCF0B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6387CDDFA42E00F349EDA8D2F40DCF0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_85BB94162AA34D2C0D66A8D2F40ECA42" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6387CDDFA42E00F349EDA8D2F40DCF0B" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_85BB94162AA34D2C0D66A8D2F40ECA42" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSystemsMember" xlink:label="loc_asgn_ApexSystemsMember_AA28F8C82581ACE5D605A8D2F40E320C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_85BB94162AA34D2C0D66A8D2F40ECA42" xlink:to="loc_asgn_ApexSystemsMember_AA28F8C82581ACE5D605A8D2F40E320C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1FE0AEF489AFBF0ABC0AA8D2F40E7BF9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1FE0AEF489AFBF0ABC0AA8D2F40E7BF9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_F116551AE5105BA8C16CA8D2F40E41DE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1FE0AEF489AFBF0ABC0AA8D2F40E7BF9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_F116551AE5105BA8C16CA8D2F40E41DE" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ContractorRelationsMember" xlink:label="loc_asgn_ContractorRelationsMember_9197E960784331F28101A8D2F40EED81" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_F116551AE5105BA8C16CA8D2F40E41DE" xlink:to="loc_asgn_ContractorRelationsMember_9197E960784331F28101A8D2F40EED81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_2272D8417675DB0C2C17A8D2F40E5A40" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_F116551AE5105BA8C16CA8D2F40E41DE" xlink:to="loc_us-gaap_CustomerRelationshipsMember_2272D8417675DB0C2C17A8D2F40E5A40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_70B9EBA64F41471C8FC1A8D2F40E78BA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_F116551AE5105BA8C16CA8D2F40E41DE" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_70B9EBA64F41471C8FC1A8D2F40E78BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_FFFF0D5FA5AC5E376116A8D2F40E9444" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_FFFF0D5FA5AC5E376116A8D2F40E9444" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_075C743A1537B57E2C64A8D2F40E149C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_FFFF0D5FA5AC5E376116A8D2F40E9444" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_075C743A1537B57E2C64A8D2F40E149C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TrademarksMember" xlink:label="loc_us-gaap_TrademarksMember_11C4D05DA77A473C6307A8D2F40EBC57" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_075C743A1537B57E2C64A8D2F40E149C" xlink:to="loc_us-gaap_TrademarksMember_11C4D05DA77A473C6307A8D2F40EBC57" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_AcquiredIntangibleAssetsLineItems" xlink:label="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_28D7672CDE0D5DCBB023A8D2F40D0F7B" xlink:to="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetAmount" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_954D6CA383ADC773ACA3A8D2F40F6D17" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_954D6CA383ADC773ACA3A8D2F40F6D17" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_AcquiredFiniteLivedIntangibleAssetsAverageUsefulLife" xlink:label="loc_asgn_AcquiredFiniteLivedIntangibleAssetsAverageUsefulLife_2B56D94178B393A94298A8D2F40FF254" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:to="loc_asgn_AcquiredFiniteLivedIntangibleAssetsAverageUsefulLife_2B56D94178B393A94298A8D2F40FF254" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount" xlink:label="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount_AD405DAA6897C4ACF400A8D2F40FEF47" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:to="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount_AD405DAA6897C4ACF400A8D2F40FEF47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill_2671AA270E1EC49496A2A8D2F40F5FB3" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AcquiredIntangibleAssetsLineItems_B6DE577BC8A31F4B5D20A8D2F40E1F6A" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill_2671AA270E1EC49496A2A8D2F40F5FB3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsScheduleOfPurchasePriceAllocationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_70B39B47E6E9640B57EAF1F7E3A6A075" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4E3D36C6E6447B41047F1F7E3A63FAD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_70B39B47E6E9640B57EAF1F7E3A6A075" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4E3D36C6E6447B41047F1F7E3A63FAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_CAA4D2817A95AEC26885F1F7E3A6B314" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4E3D36C6E6447B41047F1F7E3A63FAD" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_CAA4D2817A95AEC26885F1F7E3A6B314" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B5FDB404A90CC02E9D41F1F7E3A6A8F1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_CAA4D2817A95AEC26885F1F7E3A6B314" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_B5FDB404A90CC02E9D41F1F7E3A6A8F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_C4C8313B2E10F2FF06A0F1F7E3A6BB63" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4E3D36C6E6447B41047F1F7E3A63FAD" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_C4C8313B2E10F2FF06A0F1F7E3A6BB63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_87D9D9FEFCC7C19A99B9F1F7E3A69CA4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C4C8313B2E10F2FF06A0F1F7E3A6BB63" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_87D9D9FEFCC7C19A99B9F1F7E3A69CA4" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSystemsMember" xlink:label="loc_asgn_ApexSystemsMember_C7C7283ED26B0FB73C90F1F7E3A6300F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_87D9D9FEFCC7C19A99B9F1F7E3A69CA4" xlink:to="loc_asgn_ApexSystemsMember_C7C7283ED26B0FB73C90F1F7E3A6300F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4E3D36C6E6447B41047F1F7E3A63FAD" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus_533EBC9F2074ED00361FF1F7E3A6ACC2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationStatus_533EBC9F2074ED00361FF1F7E3A6ACC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets_70A1218CDD1274A4D103F1F7E3A668D6" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets_70A1218CDD1274A4D103F1F7E3A668D6" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes" xlink:label="loc_asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes_7DBCE73BB246A4E63E7BF1F7E3A7A392" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_asgn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssetsNetofTaxes_7DBCE73BB246A4E63E7BF1F7E3A7A392" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssets_66AB2538D3B494487F4DF1F7E3A7B6A6" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssets_66AB2538D3B494487F4DF1F7E3A7B6A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_2D6968E10405203188C7F1F7E3A7BFF8" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_2D6968E10405203188C7F1F7E3A7BFF8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_8A6FA60DCA74A16891DEF1F7E3A71075" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_8A6FA60DCA74A16891DEF1F7E3A71075" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill_8A93738A1A85876C34DBF1F7E3A787C7" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill_8A93738A1A85876C34DBF1F7E3A787C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets_959BD8F84AF9254B15B6F1F7E3A7C566" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets_959BD8F84AF9254B15B6F1F7E3A7C566" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_63FCA78D46AE57A32071F1F7E3A7DAE8" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_63FCA78D46AE57A32071F1F7E3A7DAE8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_87B30457314DDCB39F9BF1F7E3A72A8E" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_87B30457314DDCB39F9BF1F7E3A72A8E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities_3CD8FF1632DE6AB31820F1F7E3A72918" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities_3CD8FF1632DE6AB31820F1F7E3A72918" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed_F7219976315DE45E8251F1F7E3A77845" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed_F7219976315DE45E8251F1F7E3A77845" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_C5525B6CCDD68C3287ACF1F7E3A7BE23" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48C22E1BC82C8540E528F1F7E3A68A17" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_C5525B6CCDD68C3287ACF1F7E3A7BE23" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/AcquisitionsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_1779F7FA62E820F44BEBA8D2F447F4D2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfPurchasePriceAllocationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfPurchasePriceAllocationTableTextBlock_BACC4A899AC5E52648E1A8D2F4475337" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_1779F7FA62E820F44BEBA8D2F447F4D2" xlink:to="loc_us-gaap_ScheduleOfPurchasePriceAllocationTableTextBlock_BACC4A899AC5E52648E1A8D2F4475337" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_DAEBEC59304EA3736C3DA8D2F448DE06" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_1779F7FA62E820F44BEBA8D2F447F4D2" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_DAEBEC59304EA3736C3DA8D2F448DE06" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_6F372AC8C85843EAFA2DA8D2F448E588" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_1779F7FA62E820F44BEBA8D2F447F4D2" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_6F372AC8C85843EAFA2DA8D2F448E588" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/Aquisitions" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_53E652FCD7496DDC4D9EA8D2F3F1CAF8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8D181947384E86490948A8D2F3F1313E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_53E652FCD7496DDC4D9EA8D2F3F1CAF8" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8D181947384E86490948A8D2F3F1313E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_ACE8CB556483ABABB27FA8D2F3F191F6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8D181947384E86490948A8D2F3F1313E" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_ACE8CB556483ABABB27FA8D2F3F191F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_481439FD85C09AFC3C8AA8D2F3F124D2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ACE8CB556483ABABB27FA8D2F3F191F6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_481439FD85C09AFC3C8AA8D2F3F124D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0E97E7F3219534A20174A8D2F3F11093" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8D181947384E86490948A8D2F3F1313E" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_0E97E7F3219534A20174A8D2F3F11093" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationDisclosureTextBlock" xlink:label="loc_us-gaap_BusinessCombinationDisclosureTextBlock_42439F79AB0F372BFD7EA8D2F3F18ACA" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_53E652FCD7496DDC4D9EA8D2F3F1CAF8" xlink:to="loc_us-gaap_BusinessCombinationDisclosureTextBlock_42439F79AB0F372BFD7EA8D2F3F18ACA" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CommitmentsAndContingencies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_BDBC59E6C05719257F7EA8D2F3CF2274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8BF7229BAE1E4788B19DA8D2F3CF1D34" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_BDBC59E6C05719257F7EA8D2F3CF2274" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_8BF7229BAE1E4788B19DA8D2F3CF1D34" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_F17F2BC68B732A215D26A8D2F3C40309" xlink:type="locator" />
    <loc xlink:href="asgn-20130930.xsd#asgn_NumberOfLeasedPropertiesOwnedByRelatedParties" xlink:label="loc_asgn_NumberOfLeasedPropertiesOwnedByRelatedParties_71A6520F9D97A6626ED4A8D2F3C46689" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_F17F2BC68B732A215D26A8D2F3C40309" xlink:to="loc_asgn_NumberOfLeasedPropertiesOwnedByRelatedParties_71A6520F9D97A6626ED4A8D2F3C46689" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SelfInsuranceReserve" xlink:label="loc_us-gaap_SelfInsuranceReserve_AC515566FB77E4AAC01DA8D2F3C46426" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_F17F2BC68B732A215D26A8D2F3C40309" xlink:to="loc_us-gaap_SelfInsuranceReserve_AC515566FB77E4AAC01DA8D2F3C46426" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_3E807A7E8200BA857381A8D2F3C489DC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_F17F2BC68B732A215D26A8D2F3C40309" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_3E807A7E8200BA857381A8D2F3C489DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionContingentConsiderationPotentialCashPayment" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationPotentialCashPayment_AB6F0B36F8EAACFCBC68A8D2F3C4D0C7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_F17F2BC68B732A215D26A8D2F3C40309" xlink:to="loc_us-gaap_BusinessAcquisitionContingentConsiderationPotentialCashPayment_AB6F0B36F8EAACFCBC68A8D2F3C4D0C7" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_5F69A9F7FAF219CD689005617DD2A116" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_12C14E444DEDF28AC45605617DD25FFC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_5F69A9F7FAF219CD689005617DD2A116" xlink:to="loc_us-gaap_StatementTable_12C14E444DEDF28AC45605617DD25FFC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_4F92B5147802FB155D1705617DD214D2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_12C14E444DEDF28AC45605617DD25FFC" xlink:to="loc_us-gaap_StatementScenarioAxis_4F92B5147802FB155D1705617DD214D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_66D697139AF1B411CD8805617DD21FB9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_4F92B5147802FB155D1705617DD214D2" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_66D697139AF1B411CD8805617DD21FB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_12C14E444DEDF28AC45605617DD25FFC" xlink:to="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_F10E75C964722F6B33A905617DD2D4FD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_AssetsAbstract_F10E75C964722F6B33A905617DD2D4FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_F10E75C964722F6B33A905617DD2D4FD" xlink:to="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_C2F1618307921E2FC0B905617DD36600" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_C2F1618307921E2FC0B905617DD36600" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_EB227E74E8082AA38B3F05617DD36BD8" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_EB227E74E8082AA38B3F05617DD36BD8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_2282495BE5392A14138405617DD3140E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_2282495BE5392A14138405617DD3140E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_DF0E034CBFDF5BEB4FFA05617DD3C5B8" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_DF0E034CBFDF5BEB4FFA05617DD3C5B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_053B6C1B6421BF2B7BF705617DD3235E" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_OtherAssetsCurrent_053B6C1B6421BF2B7BF705617DD3235E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_DC8941C93CCA97F9462D05617DD307FB" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_A042718A8D784D627D7E05617DD34427" xlink:to="loc_us-gaap_AssetsCurrent_DC8941C93CCA97F9462D05617DD307FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_F1303A3C666CA9EA4A2105617DD38106" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_F1303A3C666CA9EA4A2105617DD38106" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_C315AEBD30F5F89FF90F05617DD35AF4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_Goodwill_C315AEBD30F5F89FF90F05617DD35AF4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_907AA0FF05B70AA2623C05617DD38D97" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_907AA0FF05B70AA2623C05617DD38D97" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_8EC4A0857B1DA9D20BDB05617DD3021E" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_8EC4A0857B1DA9D20BDB05617DD3021E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_C1AA43A6AB338D6B2F5405617DD31E17" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_Assets_C1AA43A6AB338D6B2F5405617DD31E17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_D717D49782AD5A227D9F05617DD276DF" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLongTermDebtCurrent" xlink:label="loc_us-gaap_OtherLongTermDebtCurrent_B706419A24A13666F59F05617DD4622E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_OtherLongTermDebtCurrent_B706419A24A13666F59F05617DD4622E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_4D6C58F19568825426CD05617DD4E1C5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_AccountsPayableCurrent_4D6C58F19568825426CD05617DD4E1C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_86E3751A7C010E5A051605617DD46320" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_86E3751A7C010E5A051605617DD46320" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrent_D27A4DEBE2E10E00052A05617DD47091" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrent_D27A4DEBE2E10E00052A05617DD47091" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WorkersCompensationLiabilityCurrent" xlink:label="loc_us-gaap_WorkersCompensationLiabilityCurrent_88DD3530577B454FEC4305617DD4FB68" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_WorkersCompensationLiabilityCurrent_88DD3530577B454FEC4305617DD4FB68" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_FEE0C2579896F93AFBAC05617DD484E0" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_FEE0C2579896F93AFBAC05617DD484E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_179CAFF30A94C6E2C78105617DD4311B" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_179CAFF30A94C6E2C78105617DD4311B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_75D253C6E03D7E89BBBF05617DD4FAAD" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_75D253C6E03D7E89BBBF05617DD4FAAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_100CB8BC9D305C3A329705617DD44B22" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5A3B9091685D2E7B4C8605617DD4B6B9" xlink:to="loc_us-gaap_LiabilitiesCurrent_100CB8BC9D305C3A329705617DD44B22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_C970AF3093E09803927A05617DD49AA4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_C970AF3093E09803927A05617DD49AA4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_7923CE205A0637CB825705617DD4A995" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_7923CE205A0637CB825705617DD4A995" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_6D12387EEA21C0EAADAA05617DD40D5C" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_6D12387EEA21C0EAADAA05617DD40D5C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_3D62FD0DEB3563F3110A05617DD51A8D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_Liabilities_3D62FD0DEB3563F3110A05617DD51A8D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_1546BC62D3EE1C54A99105617DD530CE" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_CommitmentsAndContingencies_1546BC62D3EE1C54A99105617DD530CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_BA02FDC2C33D8DD639EA05617DD5F416" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_PreferredStockValue_BA02FDC2C33D8DD639EA05617DD5F416" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_7B9E1185A3BEB6A2135205617DD546B9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_CommonStockValue_7B9E1185A3BEB6A2135205617DD546B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_16C18FD480A7CE86340005617DD54DB7" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_16C18FD480A7CE86340005617DD54DB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_B87F9FA7B9333485F1DD05617DD56946" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_B87F9FA7B9333485F1DD05617DD56946" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_4F5BD9FCC7F0D75C5F6E05617DD5C0AC" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_4F5BD9FCC7F0D75C5F6E05617DD5C0AC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_D3F03200C997B33B80B705617DD5449A" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_0A03A28BB1CE61E4591105617DD5AA2C" xlink:to="loc_us-gaap_StockholdersEquity_D3F03200C997B33B80B705617DD5449A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_DBEE18C7680B159037F205617DD52861" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_A62F970976AC539C1A1005617DD47D64" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_DBEE18C7680B159037F205617DD52861" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_C27C34824F17FEB7BB2DA8D2F4037C68" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_F8DE67DB5D413CC2D347A8D2F40357F7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_C27C34824F17FEB7BB2DA8D2F4037C68" xlink:to="loc_us-gaap_StatementTable_F8DE67DB5D413CC2D347A8D2F40357F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_BEFF53A56596E60F168FA8D2F40344DC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_F8DE67DB5D413CC2D347A8D2F40357F7" xlink:to="loc_us-gaap_StatementScenarioAxis_BEFF53A56596E60F168FA8D2F40344DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_CBA73E5DE0DA8812B80EA8D2F403162C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_BEFF53A56596E60F168FA8D2F40344DC" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_CBA73E5DE0DA8812B80EA8D2F403162C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_4C806DA0A7CBE7CBBFD7A8D2F403CD8F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_F8DE67DB5D413CC2D347A8D2F40357F7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_4C806DA0A7CBE7CBBFD7A8D2F403CD8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_52F300BDC29DBB85B674A8D2F4037C88" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4C806DA0A7CBE7CBBFD7A8D2F403CD8F" xlink:to="loc_us-gaap_ClassOfStockDomain_52F300BDC29DBB85B674A8D2F4037C88" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_FE3F1B6B624D21355459A8D2F403268A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_F8DE67DB5D413CC2D347A8D2F40357F7" xlink:to="loc_us-gaap_StatementLineItems_FE3F1B6B624D21355459A8D2F403268A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_1DD4B9739567B449FB82A8D2F403A36D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_FE3F1B6B624D21355459A8D2F403268A" xlink:to="loc_us-gaap_AssetsAbstract_1DD4B9739567B449FB82A8D2F403A36D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_258B7005DFAE52997844A8D2F40364A5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_1DD4B9739567B449FB82A8D2F403A36D" xlink:to="loc_us-gaap_AssetsCurrentAbstract_258B7005DFAE52997844A8D2F40364A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_412FD901828B0B3C3DF2A8D2F403E173" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_258B7005DFAE52997844A8D2F40364A5" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_412FD901828B0B3C3DF2A8D2F403E173" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_500B9720AF157C61D4E7A8D2F4038982" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_FE3F1B6B624D21355459A8D2F403268A" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_500B9720AF157C61D4E7A8D2F4038982" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_500B9720AF157C61D4E7A8D2F4038982" xlink:to="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_BAF53237CA8C1D9D9FACA8D2F404CCA0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_BAF53237CA8C1D9D9FACA8D2F404CCA0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_66B3E1834F2B5DCB8385A8D2F4046361" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_66B3E1834F2B5DCB8385A8D2F4046361" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_409627E52051272C5DF1A8D2F404E485" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_PreferredStockSharesIssued_409627E52051272C5DF1A8D2F404E485" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_487CFCAD3AB46162B47EA8D2F404F5A3" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_487CFCAD3AB46162B47EA8D2F404F5A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_32070D94A776ECBE211EA8D2F4040E26" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_32070D94A776ECBE211EA8D2F4040E26" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_44FE31D347FFB5CD2E0FA8D2F40498E4" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_44FE31D347FFB5CD2E0FA8D2F40498E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_159DEAF6AF784E6C4431A8D2F4045C91" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_CommonStockSharesIssued_159DEAF6AF784E6C4431A8D2F4045C91" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_7A850D69FD0C3B3E9CCFA8D2F4040D38" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D9B02C7DB934A15E54CFA8D2F404FE95" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_7A850D69FD0C3B3E9CCFA8D2F4040D38" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_136E8A4F427089FF74AD0539654BAD96" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DB4D8F154EF58E18E2530539654DF454" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_136E8A4F427089FF74AD0539654BAD96" xlink:to="loc_us-gaap_StatementTable_DB4D8F154EF58E18E2530539654DF454" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_8923609AC34C10AB0E890539654EA4B8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_DB4D8F154EF58E18E2530539654DF454" xlink:to="loc_us-gaap_StatementScenarioAxis_8923609AC34C10AB0E890539654EA4B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_3B305E641F89917EF9690539654E5016" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_8923609AC34C10AB0E890539654EA4B8" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_3B305E641F89917EF9690539654E5016" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_DB4D8F154EF58E18E2530539654DF454" xlink:to="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_FD1184CB6A81DD27EBF30539654F2F2B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:to="loc_us-gaap_NetIncomeLoss_FD1184CB6A81DD27EBF30539654F2F2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_5905E19D07CBDC5795040539654F7000" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_5905E19D07CBDC5795040539654F7000" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_A0C3845AD30B989F014E0539654FB6DF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_A0C3845AD30B989F014E0539654FB6DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_FF2D69C9225AA82DDBD40539654FDF49" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_ShareBasedCompensation_FF2D69C9225AA82DDBD40539654FDF49" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_507DCF1F492310786AE00539654F7370" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_507DCF1F492310786AE00539654F7370" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_C2C4B2D5F8522636727A0539654FE525" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_C2C4B2D5F8522636727A0539654FE525" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_WorkersCompensationAndMedicalMalpracticeProvision" xlink:label="loc_asgn_WorkersCompensationAndMedicalMalpracticeProvision_E35B6EAC582A207E6EE90539654F13E3" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_asgn_WorkersCompensationAndMedicalMalpracticeProvision_E35B6EAC582A207E6EE90539654F13E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNoncashIncome" xlink:label="loc_us-gaap_OtherNoncashIncome_1BFC7A6C477C3D3667E20539654F6E64" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4D7FCA3DDE7435E4FC60539654FF71F" xlink:to="loc_us-gaap_OtherNoncashIncome_1BFC7A6C477C3D3667E20539654F6E64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_FA1A68041621E06489B105396550F097" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_FA1A68041621E06489B105396550F097" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_IncreaseDecreaseInPrepaidExpensesAndIncomeTaxes" xlink:label="loc_asgn_IncreaseDecreaseInPrepaidExpensesAndIncomeTaxes_5965342904EF46BA9C5D0539655070A9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_asgn_IncreaseDecreaseInPrepaidExpensesAndIncomeTaxes_5965342904EF46BA9C5D0539655070A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_2AE1B48E9F7127F6D3000539655015D6" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_2AE1B48E9F7127F6D3000539655015D6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedSalaries" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedSalaries_F1AC99A824FD5D8C2EBD053965507FFD" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedSalaries_F1AC99A824FD5D8C2EBD053965507FFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCompensation" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_3C14E326708339B1F9B0053965503B8D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_3C14E326708339B1F9B0053965503B8D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_D980C9F0A2C27E637373053965509134" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_C59E973D06CCE9BC75DA05396550E97F" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_D980C9F0A2C27E637373053965509134" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_67FA8ADD375EF5496EE005396550DDD7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5A62088912A9B1BEC6570539654E6364" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_67FA8ADD375EF5496EE005396550DDD7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_45948544FAF7D2F3B7060539655064A9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_45948544FAF7D2F3B7060539655064A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_606CC915AACC62DB8191053965509B2B" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_606CC915AACC62DB8191053965509B2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_B3D237D09B4702E9CC2805396550A91C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_B3D237D09B4702E9CC2805396550A91C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5251974E17D962B5D435053965500BCC" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5251974E17D962B5D435053965500BCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_332FF3CD16C857134F7105396550B92A" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A41F4A7C2A817C194F920539655076E0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_332FF3CD16C857134F7105396550B92A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_0ADA8E4A1EF00798CF28053965518E16" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_0ADA8E4A1EF00798CF28053965518E16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B3C16EC0BC327A4D55A105396551A688" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B3C16EC0BC327A4D55A105396551A688" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_67DBAA23E577B62F98DD05396551050A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_67DBAA23E577B62F98DD05396551050A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForOtherTaxes" xlink:label="loc_us-gaap_PaymentsForOtherTaxes_20A3089948400B1B07520539655189A0" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_PaymentsForOtherTaxes_20A3089948400B1B07520539655189A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_4308FBEDF325461C58BB05396551086D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_4308FBEDF325461C58BB05396551086D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_3363C685D66533F1B7A3053965512557" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_3363C685D66533F1B7A3053965512557" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherPaymentsToAcquireBusinesses" xlink:label="loc_us-gaap_OtherPaymentsToAcquireBusinesses_D0C2EEEECE1441845C85053965519E83" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_OtherPaymentsToAcquireBusinesses_D0C2EEEECE1441845C85053965519E83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_AA9F46982631C00C803B053965511AB7" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_AA9F46982631C00C803B053965511AB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_91AFD7A020F4D89BEF890539655130FF" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_361358A7FE3435C3B36A053965501F47" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_91AFD7A020F4D89BEF890539655130FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_B42D04C461060DA80262053965513262" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_B42D04C461060DA80262053965513262" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B46D956E9A317D11ADC10539655191CB" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B46D956E9A317D11ADC10539655191CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_908DA1E71F2B7B066990053965515485" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_908DA1E71F2B7B066990053965515485" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BA5AA1370341270C2E0E05396551D010" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BA5AA1370341270C2E0E05396551D010" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_F897CF5315AAA0B07B0D053965517745" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_F897CF5315AAA0B07B0D053965517745" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_DD17A3AB226B6E33C37C0539655101D3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_F897CF5315AAA0B07B0D053965517745" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_DD17A3AB226B6E33C37C0539655101D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_8B4BA0226AEFC5E711C4053965518241" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_F897CF5315AAA0B07B0D053965517745" xlink:to="loc_us-gaap_InterestPaidNet_8B4BA0226AEFC5E711C4053965518241" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract" xlink:label="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_0F2AE90D65446CE9362D053965511210" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_459AB96B499BA8AE0AE90539654E7796" xlink:to="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_0F2AE90D65446CE9362D053965511210" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_B85239210824FE225587053965523A99" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_0F2AE90D65446CE9362D053965511210" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_B85239210824FE225587053965523A99" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_39AD4B36A79A7F831117053965524127" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_0F2AE90D65446CE9362D053965511210" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_39AD4B36A79A7F831117053965524127" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssued1" xlink:label="loc_us-gaap_StockIssued1_21347F69020593E409E605396552B658" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_0F2AE90D65446CE9362D053965511210" xlink:to="loc_us-gaap_StockIssued1_21347F69020593E409E605396552B658" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_9AD6D1E234E3436FF307F09FBF2E0DA4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_E7EAF139D2D26C9C465DF09FBF2E8A8C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_9AD6D1E234E3436FF307F09FBF2E0DA4" xlink:to="loc_us-gaap_StatementTable_E7EAF139D2D26C9C465DF09FBF2E8A8C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_930E69CB0337C2BA3969F09FBF2EEEB6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_E7EAF139D2D26C9C465DF09FBF2E8A8C" xlink:to="loc_us-gaap_StatementScenarioAxis_930E69CB0337C2BA3969F09FBF2EEEB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_1F7CC64ABA543C539892F09FBF2E58B6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_930E69CB0337C2BA3969F09FBF2EEEB6" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_1F7CC64ABA543C539892F09FBF2E58B6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_E7EAF139D2D26C9C465DF09FBF2E8A8C" xlink:to="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_7F06C3E20DE9C682CD7FF09FBF2EF1F9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_SalesRevenueServicesNet_7F06C3E20DE9C682CD7FF09FBF2EF1F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfServices" xlink:label="loc_us-gaap_CostOfServices_11B1A380A95CF535D988F09FBF2E30F2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_CostOfServices_11B1A380A95CF535D988F09FBF2E30F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_0D98BA6979D606F456B2F09FBF2EE16A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_GrossProfit_0D98BA6979D606F456B2F09FBF2EE16A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_CBA73630FA0C6C459E6DF09FBF2E51E4" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_CBA73630FA0C6C459E6DF09FBF2E51E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_718E4D0D541790B98464F09FBF2EB069" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_718E4D0D541790B98464F09FBF2EB069" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_1DCBE1C27E12426AAF26F09FBF2F8B58" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_OperatingIncomeLoss_1DCBE1C27E12426AAF26F09FBF2F8B58" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_C93C49BBD9C45F168703F09FBF2F9B3B" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_InterestExpense_C93C49BBD9C45F168703F09FBF2F9B3B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_6B580E29146B39C52E84F09FBF2FC516" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_6B580E29146B39C52E84F09FBF2FC516" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_76113DD8A3A33CB1A98DF09FBF2F2F5C" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_76113DD8A3A33CB1A98DF09FBF2F2F5C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_2C9B9586BBADF34BD422F09FBF2FF5CA" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_2C9B9586BBADF34BD422F09FBF2FF5CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_2582E087B5F2B516376AF09FBF2F9A7C" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_2582E087B5F2B516376AF09FBF2F9A7C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_9FDC288866C8FA4E2B1FF09FBF2FE246" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_9FDC288866C8FA4E2B1FF09FBF2FE246" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_A86986512FB475D4A0B1F09FBF2F6BD9" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_A86986512FB475D4A0B1F09FBF2F6BD9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_F903AF1C12B52465F581F09FBF2F7A04" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_F903AF1C12B52465F581F09FBF2F7A04" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_D5DA84C090524E6826DEF09FBF2F9E9A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_F903AF1C12B52465F581F09FBF2F7A04" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_D5DA84C090524E6826DEF09FBF2F9E9A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8047A3FFF2C32DA0095CF09FBF2FF139" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_F903AF1C12B52465F581F09FBF2F7A04" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8047A3FFF2C32DA0095CF09FBF2FF139" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_0BC61D20E5A7091FD9B6F09FBF2FA9CF" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_F903AF1C12B52465F581F09FBF2F7A04" xlink:to="loc_us-gaap_EarningsPerShareBasic_0BC61D20E5A7091FD9B6F09FBF2FA9CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_983CAB85A5CE5B9EDE0DF09FBF2F7DCF" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_983CAB85A5CE5B9EDE0DF09FBF2F7DCF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_4F7ECB078E4677A31F56F09FBF2F672F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_983CAB85A5CE5B9EDE0DF09FBF2F7DCF" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_4F7ECB078E4677A31F56F09FBF2F672F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_9564064587CD3058768DF09FBF305BD5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_983CAB85A5CE5B9EDE0DF09FBF2F7DCF" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_9564064587CD3058768DF09FBF305BD5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_2BC5198A27544F0CE5FEF09FBF30C9C5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_983CAB85A5CE5B9EDE0DF09FBF2F7DCF" xlink:to="loc_us-gaap_EarningsPerShareDiluted_2BC5198A27544F0CE5FEF09FBF30C9C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_37618AC32E2D831B9C49F09FBF301DEB" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_37618AC32E2D831B9C49F09FBF301DEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_DB8D43E8640F4C6B23A7F09FBF30C65F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_37618AC32E2D831B9C49F09FBF301DEB" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_DB8D43E8640F4C6B23A7F09FBF30C65F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2223B9A0D472C53896DEF09FBF3002BB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_37618AC32E2D831B9C49F09FBF301DEB" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2223B9A0D472C53896DEF09FBF3002BB" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract" xlink:label="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C676D480A9D0813A251AF09FBF2EC05C" xlink:to="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_C605D4B370F05485DE14F09FBF30A35B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:to="loc_us-gaap_NetIncomeLoss_C605D4B370F05485DE14F09FBF30A35B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_B907FE60B6DD113AD568F09FBF30748A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_B907FE60B6DD113AD568F09FBF30748A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_A440E3094C5C37480341F09FBF307326" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_A440E3094C5C37480341F09FBF307326" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_32BE81BA7F2AB5CE4731F09FBF305BA2" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ReconciliationOfNetIncomeToComprehensiveIncomeAbstract_90C0644EE1C7F8F6C851F09FBF3064AD" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_32BE81BA7F2AB5CE4731F09FBF305BA2" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_F706F149E99954FC2C38A8D2F3AF4FE6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_C3ED29F97D442F827AA3A8D2F3AFD6C3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F706F149E99954FC2C38A8D2F3AF4FE6" xlink:to="loc_us-gaap_StatementTable_C3ED29F97D442F827AA3A8D2F3AFD6C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D04CF22D5F332FA9B5B2A8D2F3B08359" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_C3ED29F97D442F827AA3A8D2F3AFD6C3" xlink:to="loc_us-gaap_StatementScenarioAxis_D04CF22D5F332FA9B5B2A8D2F3B08359" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_29D609DC6CC27E082E83A8D2F3B03D31" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_D04CF22D5F332FA9B5B2A8D2F3B08359" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_29D609DC6CC27E082E83A8D2F3B03D31" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_C005D58B43A5EB45DCCAA8D2F3B01091" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_C3ED29F97D442F827AA3A8D2F3AFD6C3" xlink:to="loc_us-gaap_StatementLineItems_C005D58B43A5EB45DCCAA8D2F3B01091" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_666BC8C46D9C68A543B9A8D2F3B0984B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_C005D58B43A5EB45DCCAA8D2F3B01091" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_666BC8C46D9C68A543B9A8D2F3B0984B" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperations" xlink:type="extended">
    <loc xlink:href="asgn-20130930.xsd#asgn_DiscontinuedOperationsAbstract" xlink:label="loc_asgn_DiscontinuedOperationsAbstract_E2ED850DF5834632AB1FA8D2F3CD720E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_08566D5DCA0EB439D1BFA8D2F3CD4264" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_DiscontinuedOperationsAbstract_E2ED850DF5834632AB1FA8D2F3CD720E" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_08566D5DCA0EB439D1BFA8D2F3CD4264" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperationsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_266F4781E7B354B756A5A8D2F439F561" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_266F4781E7B354B756A5A8D2F439F561" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_6793644FFF57ACAA317BA8D2F4395637" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_6793644FFF57ACAA317BA8D2F4395637" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_0D7D3A87FD16A1BE81C0A8D2F439BDD0" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_0D7D3A87FD16A1BE81C0A8D2F439BDD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_4F14CC56988FAFE0EBB7A8D2F4395B0A" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_4F14CC56988FAFE0EBB7A8D2F4395B0A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_4C8053A93986AB2CD996A8D2F439CAD7" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_4C8053A93986AB2CD996A8D2F439CAD7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_2AC29DE8F8BD26993BB2A8D2F4397967" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_A568606B2AC9D98D3FE5A8D2F438733B" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_2AC29DE8F8BD26993BB2A8D2F4397967" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/DiscontinuedOperationsDiscontinuedOperationsTables" xlink:type="extended">
    <loc xlink:href="asgn-20130930.xsd#asgn_DiscontinuedOperationsAbstract" xlink:label="loc_asgn_DiscontinuedOperationsAbstract_33155BF78D04F250C1C3A8D2F3EFE761" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock" xlink:label="loc_us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock_EC225A6E302C9081376BA8D2F3EFD83A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_DiscontinuedOperationsAbstract_33155BF78D04F250C1C3A8D2F3EFE761" xlink:to="loc_us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock_EC225A6E302C9081376BA8D2F3EFD83A" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <loc xlink:href="asgn-20130930.xsd#asgn_DocumentAndEntityInformationAbstract" xlink:label="loc_asgn_DocumentAndEntityInformationAbstract_68720355F9005B1AB54914C4567C39DB" xlink:type="locator" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_A5998E2D1E290095DFF814C4567C9846" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_DocumentAndEntityInformationAbstract_68720355F9005B1AB54914C4567C39DB" xlink:to="loc_dei_EntitiesTable_A5998E2D1E290095DFF814C4567C9846" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_AC8A9457E3302013926214C4567C08FE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_A5998E2D1E290095DFF814C4567C9846" xlink:to="loc_dei_LegalEntityAxis_AC8A9457E3302013926214C4567C08FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_218462AC4306C80A061914C4567CF2AE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_AC8A9457E3302013926214C4567C08FE" xlink:to="loc_dei_EntityDomain_218462AC4306C80A061914C4567CF2AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_A5998E2D1E290095DFF814C4567C9846" xlink:to="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_C59E6E96A865EB85236A14C4567DAA64" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_EntityRegistrantName_C59E6E96A865EB85236A14C4567DAA64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_934F358F59AC492D2BE914C4567D4409" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_EntityCentralIndexKey_934F358F59AC492D2BE914C4567D4409" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_7C71ABC1A0147BA09B9114C4567D633D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_CurrentFiscalYearEndDate_7C71ABC1A0147BA09B9114C4567D633D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_63AF2D51288256C6BB1014C4567D8C74" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_EntityFilerCategory_63AF2D51288256C6BB1014C4567D8C74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_1205E2F9EF1F579135D214C4567DBAC3" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_DocumentType_1205E2F9EF1F579135D214C4567DBAC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_BB06631FF3596EB53D3914C4567DC76E" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_DocumentPeriodEndDate_BB06631FF3596EB53D3914C4567DC76E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_195033861F65B1EF582714C4567DBF75" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_DocumentFiscalYearFocus_195033861F65B1EF582714C4567DBF75" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_DFA7503406B320E4187E14C4567DAF3A" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_DocumentFiscalPeriodFocus_DFA7503406B320E4187E14C4567DAF3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_D7BA63432EDB9622E85F14C456832E4D" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_AmendmentFlag_D7BA63432EDB9622E85F14C456832E4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_DF9FFEC8909639CB262C14C4568370CC" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_54D9C6D1D54BE16B94B714C4567C3FF5" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_DF9FFEC8909639CB262C14C4568370CC" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/EarningsPerShare" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_E7B6F65C8AAE9498A8CBA8D2F3D1EE3D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_38C8E23C848FE9D16274A8D2F3D15A90" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_E7B6F65C8AAE9498A8CBA8D2F3D1EE3D" xlink:to="loc_us-gaap_EarningsPerShareTextBlock_38C8E23C848FE9D16274A8D2F3D15A90" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/EarningsPerShareAntiDilutiveDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_BA97ACA108AD60BA89C6A8D2F45FC9F5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_C7118096ABAC51184588A8D2F45F1083" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_BA97ACA108AD60BA89C6A8D2F45FC9F5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_C7118096ABAC51184588A8D2F45F1083" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/EarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_DED82448E7EEF655F5D6A8D2F3F96380" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_E23D7EC9183DC46861EBA8D2F3F9562D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_DED82448E7EEF655F5D6A8D2F3F96380" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_E23D7EC9183DC46861EBA8D2F3F9562D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_190C2949747801996B46A8D2F3F9795B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_E23D7EC9183DC46861EBA8D2F3F9562D" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_190C2949747801996B46A8D2F3F9795B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_8F2D66CD54FE39F8D67BA8D2F3F99ED4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_E23D7EC9183DC46861EBA8D2F3F9562D" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_8F2D66CD54FE39F8D67BA8D2F3F99ED4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_B338016C620488AC6F72A8D2F3F99D15" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_E23D7EC9183DC46861EBA8D2F3F9562D" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_B338016C620488AC6F72A8D2F3F99D15" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/EarningsPerShareTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_CEB856919109F01B3782A8D2F3E0366F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_F71B11A5B1E7AF6C28AEA8D2F3E00B2B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CEB856919109F01B3782A8D2F3E0366F" xlink:to="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_F71B11A5B1E7AF6C28AEA8D2F3E00B2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_665B5AD39878F56F33B3A8D2F3E0AE10" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CEB856919109F01B3782A8D2F3E0366F" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_665B5AD39878F56F33B3A8D2F3E0AE10" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurements" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_530D78D3E6A0C624A8D806238A3378F8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_51114599F417B2ECDE6F06238A347EB2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_530D78D3E6A0C624A8D806238A3378F8" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_51114599F417B2ECDE6F06238A347EB2" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurementsFairValueInputsLiabilitiesQuantitativeInformationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_928C0F8054616DDC8811A8D2F444F45D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable" xlink:label="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_928C0F8054616DDC8811A8D2F444F45D" xlink:to="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C335344BD3F6391BC5A2A8D2F4456B82" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C335344BD3F6391BC5A2A8D2F4456B82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_11B0EC003C36ACD94568A8D2F445420F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_C335344BD3F6391BC5A2A8D2F4456B82" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_11B0EC003C36ACD94568A8D2F445420F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_6724046718C9D2E1403BA8D2F445174F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_11B0EC003C36ACD94568A8D2F445420F" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_6724046718C9D2E1403BA8D2F445174F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_A81C60AA21E24D7CC569A8D2F445A5DC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_11B0EC003C36ACD94568A8D2F445420F" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_A81C60AA21E24D7CC569A8D2F445A5DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_3510A8211EAA2C87F6B7A8D2F445070D" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_3510A8211EAA2C87F6B7A8D2F445070D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_296AEBB03B683C996EA7A8D2F4458F39" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_3510A8211EAA2C87F6B7A8D2F445070D" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_296AEBB03B683C996EA7A8D2F4458F39" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ContingentConsiderationLiabilityMember" xlink:label="loc_asgn_ContingentConsiderationLiabilityMember_FE110207DC0573776F06A8D2F445779E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_296AEBB03B683C996EA7A8D2F4458F39" xlink:to="loc_asgn_ContingentConsiderationLiabilityMember_FE110207DC0573776F06A8D2F445779E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_03AF02575E9E4A2C4322A8D2F445471B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:to="loc_us-gaap_RangeAxis_03AF02575E9E4A2C4322A8D2F445471B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_FDA7700EB10E0B27DFC0A8D2F445D72D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_03AF02575E9E4A2C4322A8D2F445471B" xlink:to="loc_us-gaap_RangeMember_FDA7700EB10E0B27DFC0A8D2F445D72D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_453B4CB515597125C7ADA8D2F445247E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_FDA7700EB10E0B27DFC0A8D2F445D72D" xlink:to="loc_us-gaap_MinimumMember_453B4CB515597125C7ADA8D2F445247E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_B51B82AE72F1255CACCEA8D2F44534CE" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_FDA7700EB10E0B27DFC0A8D2F445D72D" xlink:to="loc_us-gaap_MaximumMember_B51B82AE72F1255CACCEA8D2F44534CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems" xlink:label="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationTable_805324850740B21730F8A8D2F444BC2B" xlink:to="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_187E4F039EB564AE3606A8D2F44579D6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:to="loc_us-gaap_LongTermDebt_187E4F039EB564AE3606A8D2F44579D6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_A4F1E4742828AC08F2A5A8D2F4468874" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:to="loc_us-gaap_LongTermDebtFairValue_A4F1E4742828AC08F2A5A8D2F4468874" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_FairValueInputsProbabilityOfOccurrenceOfScenarios" xlink:label="loc_asgn_FairValueInputsProbabilityOfOccurrenceOfScenarios_6093EE30E0D0C4D98447A8D2F446F955" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:to="loc_asgn_FairValueInputsProbabilityOfOccurrenceOfScenarios_6093EE30E0D0C4D98447A8D2F446F955" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_FairValueInputsWeightingGivenToBaseCaseScenario" xlink:label="loc_asgn_FairValueInputsWeightingGivenToBaseCaseScenario_9E93E963B106AAAF3322A8D2F4461677" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:to="loc_asgn_FairValueInputsWeightingGivenToBaseCaseScenario_9E93E963B106AAAF3322A8D2F4461677" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLongTermRevenueGrowthRate" xlink:label="loc_us-gaap_FairValueInputsLongTermRevenueGrowthRate_16A79B48A6BA962B5CCEA8D2F446525A" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueInputsLiabilitiesQuantitativeInformationLineItems_51CF8443947B8441124FA8D2F445FFB3" xlink:to="loc_us-gaap_FairValueInputsLongTermRevenueGrowthRate_16A79B48A6BA962B5CCEA8D2F446525A" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurementsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_CC2125F3D0EFE4CF47E6A8D2F4229F71" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A6431C0057D224DB0C58A8D2F422D17A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_CC2125F3D0EFE4CF47E6A8D2F4229F71" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A6431C0057D224DB0C58A8D2F422D17A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_C3F71AD71D5A1BBA8718A8D2F4226362" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A6431C0057D224DB0C58A8D2F422D17A" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_C3F71AD71D5A1BBA8718A8D2F4226362" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_265C5A8F8A8D067470EDA8D2F422ED0E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_C3F71AD71D5A1BBA8718A8D2F4226362" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_265C5A8F8A8D067470EDA8D2F422ED0E" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ContingentConsiderationLiabilityMember" xlink:label="loc_asgn_ContingentConsiderationLiabilityMember_338D6BD51BB23FAEF37FA8D2F4224F81" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_265C5A8F8A8D067470EDA8D2F422ED0E" xlink:to="loc_asgn_ContingentConsiderationLiabilityMember_338D6BD51BB23FAEF37FA8D2F4224F81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_F7FD6C9FB5E215F66202A8D2F4223607" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A6431C0057D224DB0C58A8D2F422D17A" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_F7FD6C9FB5E215F66202A8D2F4223607" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_F7FD6C9FB5E215F66202A8D2F4223607" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_25A0478A625AB7F9217DA8D2F422E881" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_25A0478A625AB7F9217DA8D2F422E881" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPayments" xlink:label="loc_asgn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPayments_6388C076E799F5CE1E63A8D2F422C846" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:to="loc_asgn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPayments_6388C076E799F5CE1E63A8D2F422C846" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_390E5FBF70068795394EA8D2F422D9B0" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_390E5FBF70068795394EA8D2F422D9B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_0188DC2D7F11B9B275D7A8D2F422943F" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_0188DC2D7F11B9B275D7A8D2F422943F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_F2BE1C4254958306A4C5A8D2F423B582" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_81B41B9D5E2032D11D8FA8D2F4228BC1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_F2BE1C4254958306A4C5A8D2F423B582" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurementsPolicies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_CB03982EE10312B0505FA8D2F3BBFE1A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_FEED431B357DB17A45EEA8D2F3BB7DEE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_CB03982EE10312B0505FA8D2F3BBFE1A" xlink:to="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_FEED431B357DB17A45EEA8D2F3BB7DEE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationsPolicy" xlink:label="loc_us-gaap_BusinessCombinationsPolicy_DFEB36C2016B93A041C7A8D2F3BB9403" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_CB03982EE10312B0505FA8D2F3BBFE1A" xlink:to="loc_us-gaap_BusinessCombinationsPolicy_DFEB36C2016B93A041C7A8D2F3BB9403" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_F976E602873D56B88910A8D2F4145600" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8E7895B5184C989A2318A8D2F414D7E4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_F976E602873D56B88910A8D2F4145600" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8E7895B5184C989A2318A8D2F414D7E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_FBB0508D37F0FB4DDDBAA8D2F41566C2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8E7895B5184C989A2318A8D2F414D7E4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_FBB0508D37F0FB4DDDBAA8D2F41566C2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_FBB0508D37F0FB4DDDBAA8D2F41566C2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_31D122DC11ED6F813AF2A8D2F4151FDA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_31D122DC11ED6F813AF2A8D2F4151FDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_5D50676BA85E4AF1C55AA8D2F415BEBD" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_5D50676BA85E4AF1C55AA8D2F415BEBD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_D07F58FC0BCCBBD64C86A8D2F415E912" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_D07F58FC0BCCBBD64C86A8D2F415E912" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_5CBB18092B84A57994B7A8D2F4151BFC" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1D98311AC861FB728288A8D2F41586F3" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_5CBB18092B84A57994B7A8D2F4151BFC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CC91C56B1FD7AC3AC1C3A8D2F415F90D" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8E7895B5184C989A2318A8D2F414D7E4" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CC91C56B1FD7AC3AC1C3A8D2F415F90D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAE1AF5597682C2ABB8EA8D2F415F1B8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CC91C56B1FD7AC3AC1C3A8D2F415F90D" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAE1AF5597682C2ABB8EA8D2F415F1B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_6C1A83179D170BDB122AA8D2F415CC06" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAE1AF5597682C2ABB8EA8D2F415F1B8" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_6C1A83179D170BDB122AA8D2F415CC06" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3CB9B5A295A541398211A8D2F41586C4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8E7895B5184C989A2318A8D2F414D7E4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3CB9B5A295A541398211A8D2F41586C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_1BE40A989CE37FF90571A8D2F415F217" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3CB9B5A295A541398211A8D2F41586C4" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_1BE40A989CE37FF90571A8D2F415F217" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FairValueMeasurementsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_26227433EB198BD0055CA8D2F3BEF193" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_10B5FBB80E2E59A6F07EA8D2F3BE78B7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_26227433EB198BD0055CA8D2F3BEF193" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_10B5FBB80E2E59A6F07EA8D2F3BE78B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_CD84A61A1357F1778310A8D2F3BEAFA3" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_26227433EB198BD0055CA8D2F3BEF193" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_CD84A61A1357F1778310A8D2F3BEAFA3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/FinancialStatementPresentation" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_3178DAB05DF12D7CDD16A8D2F3B9231C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_0972A1E144F9732B8822A8D2F3B99BC1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_3178DAB05DF12D7CDD16A8D2F3B9231C" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_0972A1E144F9732B8822A8D2F3B99BC1" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/GoodwillAndIdentifiableAssets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_7174846D2A6B9E182802A8D2F3BC8416" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_30D693FAE0F01BDD3160A8D2F3BC41F0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_7174846D2A6B9E182802A8D2F3BC8416" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_30D693FAE0F01BDD3160A8D2F3BC41F0" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsAcquiredIntangibleAssetsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_F84F6E627F615DA05F71A8D2F41B4A6B" xlink:type="locator" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable" xlink:label="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable_068F6AA14D0624B37AEFA8D2F41BAF35" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_F84F6E627F615DA05F71A8D2F41B4A6B" xlink:to="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable_068F6AA14D0624B37AEFA8D2F41BAF35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_017B94CAA7D19433180CA8D2F41CDF32" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable_068F6AA14D0624B37AEFA8D2F41BAF35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_017B94CAA7D19433180CA8D2F41CDF32" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D670D5A689A4AFBA70A4A8D2F41CDF6B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_017B94CAA7D19433180CA8D2F41CDF32" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D670D5A689A4AFBA70A4A8D2F41CDF6B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_1845E4A23A78EAB73B2CA8D2F41CD4B8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D670D5A689A4AFBA70A4A8D2F41CDF6B" xlink:to="loc_us-gaap_CustomerRelationshipsMember_1845E4A23A78EAB73B2CA8D2F41CD4B8" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ContractorRelationsMember" xlink:label="loc_asgn_ContractorRelationsMember_93DEB2DFD4FC26AA01F8A8D2F41C224A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D670D5A689A4AFBA70A4A8D2F41CDF6B" xlink:to="loc_asgn_ContractorRelationsMember_93DEB2DFD4FC26AA01F8A8D2F41C224A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_1D479FA6351B0613E47CA8D2F41C4B7F" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D670D5A689A4AFBA70A4A8D2F41CDF6B" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_1D479FA6351B0613E47CA8D2F41C4B7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_CB762EF74C019AAC6210A8D2F41C686C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable_068F6AA14D0624B37AEFA8D2F41BAF35" xlink:to="loc_us-gaap_RangeAxis_CB762EF74C019AAC6210A8D2F41C686C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_883015C08A92DB1C844FA8D2F41C524D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_CB762EF74C019AAC6210A8D2F41C686C" xlink:to="loc_us-gaap_RangeMember_883015C08A92DB1C844FA8D2F41C524D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_55A748A8E9C324B6E7B2A8D2F41C4B85" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_883015C08A92DB1C844FA8D2F41C524D" xlink:to="loc_us-gaap_MinimumMember_55A748A8E9C324B6E7B2A8D2F41C4B85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_4B7288E11B63A9FB0426A8D2F41CEFBA" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_883015C08A92DB1C844FA8D2F41C524D" xlink:to="loc_us-gaap_MaximumMember_4B7288E11B63A9FB0426A8D2F41CEFBA" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_IntangibleAssetsLineItems" xlink:label="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTable_068F6AA14D0624B37AEFA8D2F41BAF35" xlink:to="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_2214E3B3A79C6EC67687A8D2F41CDF9D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_2214E3B3A79C6EC67687A8D2F41CDF9D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_B7A2DB025CBC409CE772A8D2F41CE647" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_B7A2DB025CBC409CE772A8D2F41CE647" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_C6F96B30161F63979703A8D2F41DFC0C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_C6F96B30161F63979703A8D2F41DFC0C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_4A8CF4C7ECCAC4B60926A8D2F41D9B66" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_C6F96B30161F63979703A8D2F41DFC0C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_4A8CF4C7ECCAC4B60926A8D2F41D9B66" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_735949EF1DFFD7084B80A8D2F41DFB1A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_C6F96B30161F63979703A8D2F41DFC0C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_735949EF1DFFD7084B80A8D2F41DFB1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_53FDEAB49C9035DF4232A8D2F41D1F43" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_C6F96B30161F63979703A8D2F41DFC0C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_53FDEAB49C9035DF4232A8D2F41D1F43" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_45A060449683AAEA7EECA8D2F41DB5A1" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_45A060449683AAEA7EECA8D2F41DB5A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IndefiniteLivedTrademarks" xlink:label="loc_us-gaap_IndefiniteLivedTrademarks_3F75F655350C568A9490A8D2F41D3A58" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_45A060449683AAEA7EECA8D2F41DB5A1" xlink:to="loc_us-gaap_IndefiniteLivedTrademarks_3F75F655350C568A9490A8D2F41D3A58" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_161312AB532670B6627FA8D2F41D570F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_45A060449683AAEA7EECA8D2F41DB5A1" xlink:to="loc_us-gaap_Goodwill_161312AB532670B6627FA8D2F41D570F" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_IntangibleAssetsNetAbstract" xlink:label="loc_asgn_IntangibleAssetsNetAbstract_0B791F6055923F24D59EA8D2F41DD8A2" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsLineItems_AEC4A0D748538C3FEEBAA8D2F41CE110" xlink:to="loc_asgn_IntangibleAssetsNetAbstract_0B791F6055923F24D59EA8D2F41DD8A2" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_IntangibleAssetsGrossIncludingGoodwill" xlink:label="loc_asgn_IntangibleAssetsGrossIncludingGoodwill_FBCD2131656915E6C4FCA8D2F41D5562" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsNetAbstract_0B791F6055923F24D59EA8D2F41DD8A2" xlink:to="loc_asgn_IntangibleAssetsGrossIncludingGoodwill_FBCD2131656915E6C4FCA8D2F41D5562" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_1398AAA4EF32D1B40347A8D2F41DF400" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_IntangibleAssetsNetAbstract_0B791F6055923F24D59EA8D2F41DD8A2" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_1398AAA4EF32D1B40347A8D2F41DF400" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsFutureAmortizationExpenseDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_8DD95F0A74A2B5985194A8D2F43442A0" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_45F3E068B47CAC23A387A8D2F434C530" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_8DD95F0A74A2B5985194A8D2F43442A0" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_45F3E068B47CAC23A387A8D2F434C530" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_8DD95F0A74A2B5985194A8D2F43442A0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_AC945F0F06D1FE3939D0A8D2F4348CFF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_AC945F0F06D1FE3939D0A8D2F4348CFF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_CBD91D88F981FB6E5270A8D2F4343446" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_CBD91D88F981FB6E5270A8D2F4343446" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_2990A0DD75AD73EEC181A8D2F434C312" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_2990A0DD75AD73EEC181A8D2F434C312" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_F8DFB82D85FA028E4FCAA8D2F434841A" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_F8DFB82D85FA028E4FCAA8D2F434841A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_BF9475C580DFAD4ACBACA8D2F434B6B7" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_BF9475C580DFAD4ACBACA8D2F434B6B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_80A84BF272B97BD93DD1A8D2F434AF0B" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_80A84BF272B97BD93DD1A8D2F434AF0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_E826AF9CE8C06F3FB837A8D2F4347E48" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_39FB172F3926A0C89AA7A8D2F4347CEF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_E826AF9CE8C06F3FB837A8D2F4347E48" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsGoodwillDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BFE7590CC4776A426D6AA8D2F3D70059" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_D6FF0E82716312D711A5A8D2F3D74932" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_BFE7590CC4776A426D6AA8D2F3D70059" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_D6FF0E82716312D711A5A8D2F3D74932" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2765152A2C5150DA1543A8D2F3D7C8B0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_D6FF0E82716312D711A5A8D2F3D74932" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2765152A2C5150DA1543A8D2F3D7C8B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2765152A2C5150DA1543A8D2F3D7C8B0" xlink:to="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSegmentMember" xlink:label="loc_asgn_ApexSegmentMember_A81E25A380965637CB75A8D2F3D77A57" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:to="loc_asgn_ApexSegmentMember_A81E25A380965637CB75A8D2F3D77A57" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_OxfordSegmentMember" xlink:label="loc_asgn_OxfordSegmentMember_023AC7CC45AA15D99F41A8D2F3D70370" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:to="loc_asgn_OxfordSegmentMember_023AC7CC45AA15D99F41A8D2F3D70370" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LifeSciencesSegmentMember" xlink:label="loc_asgn_LifeSciencesSegmentMember_1EDEF7EAD7B8F8DD63E1A8D2F3D7C608" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:to="loc_asgn_LifeSciencesSegmentMember_1EDEF7EAD7B8F8DD63E1A8D2F3D7C608" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_HealthcareSegmentMember" xlink:label="loc_asgn_HealthcareSegmentMember_68C9BABD0B3979EF05A6A8D2F3D786EB" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:to="loc_asgn_HealthcareSegmentMember_68C9BABD0B3979EF05A6A8D2F3D786EB" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_PhysicianSegmentMember" xlink:label="loc_asgn_PhysicianSegmentMember_6CF97E39FB359A6BB732A8D2F3D75947" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_5D9AC7522639ED92605BA8D2F3D728C6" xlink:to="loc_asgn_PhysicianSegmentMember_6CF97E39FB359A6BB732A8D2F3D75947" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4EF13D431672CC0218ECA8D2F3D74BC5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_D6FF0E82716312D711A5A8D2F3D74932" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4EF13D431672CC0218ECA8D2F3D74BC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_342C9EE6E41464EB8F76A8D2F3D7C106" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4EF13D431672CC0218ECA8D2F3D74BC5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_342C9EE6E41464EB8F76A8D2F3D7C106" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_HealthCarePartnersMember" xlink:label="loc_asgn_HealthCarePartnersMember_A573545F4C9AF60E476DA8D2F3D8186C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_342C9EE6E41464EB8F76A8D2F3D7C106" xlink:to="loc_asgn_HealthCarePartnersMember_A573545F4C9AF60E476DA8D2F3D8186C" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSegmentMember" xlink:label="loc_asgn_ApexSegmentMember_60FA4510F02EAD3F3270A8D2F3D87D10" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_342C9EE6E41464EB8F76A8D2F3D7C106" xlink:to="loc_asgn_ApexSegmentMember_60FA4510F02EAD3F3270A8D2F3D87D10" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSystemsMember" xlink:label="loc_asgn_ApexSystemsMember_82287588F0D21A2B7731A8D2F3D80050" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_342C9EE6E41464EB8F76A8D2F3D7C106" xlink:to="loc_asgn_ApexSystemsMember_82287588F0D21A2B7731A8D2F3D80050" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_EC72AE94A909A832F983A8D2F3D8BE87" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_D6FF0E82716312D711A5A8D2F3D74932" xlink:to="loc_us-gaap_GoodwillLineItems_EC72AE94A909A832F983A8D2F3D8BE87" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillLineItems_EC72AE94A909A832F983A8D2F3D8BE87" xlink:to="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillGross" xlink:label="loc_us-gaap_GoodwillGross_6C57545A6A8A7EC1A6D1A8D2F3D8F52A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillGross_6C57545A6A8A7EC1A6D1A8D2F3D8F52A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_61B36225F11F6F258CAEA8D2F3D87697" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_61B36225F11F6F258CAEA8D2F3D87697" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_F0CDB5D03679874E5145A8D2F3D811BC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_Goodwill_F0CDB5D03679874E5145A8D2F3D811BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_E38748AEBABF453367E0A8D2F3D838A0" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_E38748AEBABF453367E0A8D2F3D838A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_0ED2D280D33F98491151A8D2F3D8074F" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_0ED2D280D33F98491151A8D2F3D8074F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1B1F3CA366B9BCB19F44A8D2F3D86668" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1B1F3CA366B9BCB19F44A8D2F3D86668" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_WriteOffOfAccumImpairmentLossRelatedToSaleOfBusinessUnit" xlink:label="loc_asgn_WriteOffOfAccumImpairmentLossRelatedToSaleOfBusinessUnit_2EB73DB50E0AD185BE8FA8D2F3D8D0BC" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_asgn_WriteOffOfAccumImpairmentLossRelatedToSaleOfBusinessUnit_2EB73DB50E0AD185BE8FA8D2F3D8D0BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillTranslationAdjustments" xlink:label="loc_us-gaap_GoodwillTranslationAdjustments_B55A79E50A0B2A2C9DD0A8D2F3D8F124" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_F7813555914ABD54A8F9A8D2F3D8F631" xlink:to="loc_us-gaap_GoodwillTranslationAdjustments_B55A79E50A0B2A2C9DD0A8D2F3D8F124" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/GoodwillAndIdentifiableAssetsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_746F5D9BAF7A12D2CD9FA8D2F4062163" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock" xlink:label="loc_us-gaap_ScheduleOfGoodwillTextBlock_EDAA2B1B8C184559AD11A8D2F4067F2E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_746F5D9BAF7A12D2CD9FA8D2F4062163" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_EDAA2B1B8C184559AD11A8D2F4067F2E" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTableTextBlock" xlink:label="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTableTextBlock_6A0FC868962D49DC9F57A8D2F406D53F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_746F5D9BAF7A12D2CD9FA8D2F4062163" xlink:to="loc_asgn_ScheduleOfAcquiredIntangibleAssetsByMajorClassTableTextBlock_6A0FC868962D49DC9F57A8D2F406D53F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_3A157BB94C5FC909A020A8D2F406A91D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_746F5D9BAF7A12D2CD9FA8D2F4062163" xlink:to="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_3A157BB94C5FC909A020A8D2F406A91D" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlan" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_25E0360DA432CCCED994A8D2F44D542A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_967CCA8BED1260542050A8D2F44D264A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_25E0360DA432CCCED994A8D2F44D542A" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_967CCA8BED1260542050A8D2F44D264A" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlanCompensationExpenseDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_C8854E8F029F9976501EA8D2F3FDCB54" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8599CE938CE3FAF86A28A8D2F3FDC0D4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_C8854E8F029F9976501EA8D2F3FDCB54" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8599CE938CE3FAF86A28A8D2F3FDC0D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_F08ECCA5283287E7D3DEA8D2F3FD6E7C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8599CE938CE3FAF86A28A8D2F3FDC0D4" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_F08ECCA5283287E7D3DEA8D2F3FD6E7C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_D59F577A615B7750AF7DA8D2F3FE3F14" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_F08ECCA5283287E7D3DEA8D2F3FD6E7C" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_D59F577A615B7750AF7DA8D2F3FE3F14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2268DC1CC8E02405F79EA8D2F3FEC76F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8599CE938CE3FAF86A28A8D2F3FDC0D4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2268DC1CC8E02405F79EA8D2F3FEC76F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_D6A13E6EE82E43FA1392A8D2F3FEA4C4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2268DC1CC8E02405F79EA8D2F3FEC76F" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_D6A13E6EE82E43FA1392A8D2F3FEA4C4" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/IncentiveAwardPlanAndEmployeeStockPurchasePlanDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_FAB650A68522821C506B296547E800F7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_FAB650A68522821C506B296547E800F7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_AwardInstrumentAxis" xlink:label="loc_asgn_AwardInstrumentAxis_E73D83D8E9F75B42930C296547E8112E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_asgn_AwardInstrumentAxis_E73D83D8E9F75B42930C296547E8112E" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_AwardInstrumentDomain" xlink:label="loc_asgn_AwardInstrumentDomain_8BFAB8DA46F4B2441B72296547E86C30" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AwardInstrumentAxis_E73D83D8E9F75B42930C296547E8112E" xlink:to="loc_asgn_AwardInstrumentDomain_8BFAB8DA46F4B2441B72296547E86C30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6EC93FF8E716476F8B13296547E8E0F8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_AwardInstrumentDomain_8BFAB8DA46F4B2441B72296547E86C30" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6EC93FF8E716476F8B13296547E8E0F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_FC68E5BCD3A6F3B4235F296547E8EF9E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_FC68E5BCD3A6F3B4235F296547E8EF9E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_24DEF23DB69EC153C8D2296547E8D07C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_FC68E5BCD3A6F3B4235F296547E8EF9E" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_24DEF23DB69EC153C8D2296547E8D07C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ChiefExecutiveOfficerMember" xlink:label="loc_us-gaap_ChiefExecutiveOfficerMember_0EC3F1E2064249553C01296547E8B575" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_24DEF23DB69EC153C8D2296547E8D07C" xlink:to="loc_us-gaap_ChiefExecutiveOfficerMember_0EC3F1E2064249553C01296547E8B575" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_OtherExecutiveOfficersMember" xlink:label="loc_asgn_OtherExecutiveOfficersMember_0F6984AEA89E61825212296547E8A628" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_24DEF23DB69EC153C8D2296547E8D07C" xlink:to="loc_asgn_OtherExecutiveOfficersMember_0F6984AEA89E61825212296547E8A628" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3FE7577E3EE587CE5B9E296547E87E6A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3FE7577E3EE587CE5B9E296547E87E6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B72017CCCEB598C69100296547E8C3E5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3FE7577E3EE587CE5B9E296547E87E6A" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B72017CCCEB598C69100296547E8C3E5" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSystemsMember" xlink:label="loc_asgn_ApexSystemsMember_5EE02D5EE27A9D46FDD8296547E890D9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B72017CCCEB598C69100296547E8C3E5" xlink:to="loc_asgn_ApexSystemsMember_5EE02D5EE27A9D46FDD8296547E890D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1CB10CC9AEC96EB3F30A296547E95A74" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_us-gaap_AwardTypeAxis_1CB10CC9AEC96EB3F30A296547E95A74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_1CB10CC9AEC96EB3F30A296547E95A74" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_PerformanceShares2012Member" xlink:label="loc_asgn_PerformanceShares2012Member_CAF75BBC67F5762F11EF296547E930E1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:to="loc_asgn_PerformanceShares2012Member_CAF75BBC67F5762F11EF296547E930E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_565CDB82EA2D2A15A84D296547E941F2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:to="loc_us-gaap_PerformanceSharesMember_565CDB82EA2D2A15A84D296547E941F2" xlink:type="arc" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6EC93FF8E716476F8B13296547E8E0F8" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_PerformanceShares2013Member" xlink:label="loc_asgn_PerformanceShares2013Member_1E79FE6CBCF300E99F2A296547E92D52" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_EE522D5194BD3AFE6859296547E96B49" xlink:to="loc_asgn_PerformanceShares2013Member_1E79FE6CBCF300E99F2A296547E92D52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_DBF8BD8EBA316D8B91BF296547E91C96" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_us-gaap_PlanNameAxis_DBF8BD8EBA316D8B91BF296547E91C96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_BCD76765D0BD25FADB9E296547E9F9FE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_DBF8BD8EBA316D8B91BF296547E91C96" xlink:to="loc_us-gaap_PlanNameDomain_BCD76765D0BD25FADB9E296547E9F9FE" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_EmployeeStockPurchasePlanMember" xlink:label="loc_asgn_EmployeeStockPurchasePlanMember_DF70E45F57CB886EF7EF296547E92496" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_BCD76765D0BD25FADB9E296547E9F9FE" xlink:to="loc_asgn_EmployeeStockPurchasePlanMember_DF70E45F57CB886EF7EF296547E92496" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7A7D91354154BDC764CF296547E8735A" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue" xlink:label="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_8580576B727EE9E3E1E4296547E9B753" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:to="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_8580576B727EE9E3E1E4296547E9B753" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_298DD47E3EDA6FDAC9BE296547E9697D" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_298DD47E3EDA6FDAC9BE296547E9697D" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents" xlink:label="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_3A893AE5CDC1D3A63BCE296547E9DDE4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:to="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_3A893AE5CDC1D3A63BCE296547E9DDE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_24BA7C4E1F342ED102E7296547E9AD51" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_24BA7C4E1F342ED102E7296547E9AD51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_38F4B2946FE772052726296547EA0522" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_BAEF7D4C97A9E4AC886C296547E9F117" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_38F4B2946FE772052726296547EA0522" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/IncomeTaxes" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_1A370C8C33AD6489D405A8D2F436B755" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_DF252C81048DB624373FA8D2F436AEC2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_1A370C8C33AD6489D405A8D2F436B755" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_DF252C81048DB624373FA8D2F436AEC2" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/IncomeTaxesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_A0EA79CFF4721546CF85A8D2F3DEE406" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxUncertaintiesAbstract" xlink:label="loc_us-gaap_IncomeTaxUncertaintiesAbstract_10CF8B0E3B2451E2744BA8D2F3DEB1F1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_A0EA79CFF4721546CF85A8D2F3DEE406" xlink:to="loc_us-gaap_IncomeTaxUncertaintiesAbstract_10CF8B0E3B2451E2744BA8D2F3DEB1F1" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/LongTermDebt" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_AEAD67459981A57CF8BEA8D2F3ADEDD9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtTextBlock" xlink:label="loc_us-gaap_LongTermDebtTextBlock_670A4CCD2BC551B3C4FCA8D2F3AD2BC6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_AEAD67459981A57CF8BEA8D2F3ADEDD9" xlink:to="loc_us-gaap_LongTermDebtTextBlock_670A4CCD2BC551B3C4FCA8D2F3AD2BC6" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/LongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_344C5249E40EA0D66EEB15013C021FDB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_344C5249E40EA0D66EEB15013C021FDB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_321689EAA22C77ED6EAB15013C0283BC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_321689EAA22C77ED6EAB15013C0283BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_E26B663FBF92052C97CF15013C03610B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_E26B663FBF92052C97CF15013C03610B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_8EF0BC0C01D30829CEB115013C03EE4D" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_8EF0BC0C01D30829CEB115013C03EE4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_E1426E52176B1D94E18C15013C0322E0" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_E1426E52176B1D94E18C15013C0322E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive_A6CF3164C6A318E477F815013C03F4A4" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive_A6CF3164C6A318E477F815013C03F4A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_1DA32CE30753840D5A9615013C03605D" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_LongTermDebt_1DA32CE30753840D5A9615013C03605D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_B282B5475B71FF6446B115013C02F96D" xlink:to="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_249F0D28A8A7103F2C9B15013C03D7BB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:to="loc_us-gaap_RangeAxis_249F0D28A8A7103F2C9B15013C03D7BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F9012E2E52406688253315013C035697" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_249F0D28A8A7103F2C9B15013C03D7BB" xlink:to="loc_us-gaap_RangeMember_F9012E2E52406688253315013C035697" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_7A6C397239C50A7F117A15013C03E120" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_F9012E2E52406688253315013C035697" xlink:to="loc_us-gaap_MaximumMember_7A6C397239C50A7F117A15013C03E120" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_82C99DA31075902E0E5015013C041411" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MaximumMember_7A6C397239C50A7F117A15013C03E120" xlink:to="loc_us-gaap_MinimumMember_82C99DA31075902E0E5015013C041411" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_InterestRateTypeAxis" xlink:label="loc_asgn_InterestRateTypeAxis_B8EC818E0690C7631D5D15013C047706" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:to="loc_asgn_InterestRateTypeAxis_B8EC818E0690C7631D5D15013C047706" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_InterestRateTypeDomain" xlink:label="loc_asgn_InterestRateTypeDomain_01E63D1C04D33D29A52315013C0474BA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_InterestRateTypeAxis_B8EC818E0690C7631D5D15013C047706" xlink:to="loc_asgn_InterestRateTypeDomain_01E63D1C04D33D29A52315013C0474BA" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_EurodollarMember" xlink:label="loc_asgn_EurodollarMember_5C3979AF04BC9091CF6715013C04694D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_InterestRateTypeDomain_01E63D1C04D33D29A52315013C0474BA" xlink:to="loc_asgn_EurodollarMember_5C3979AF04BC9091CF6715013C04694D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7DDFD4F666C65699D0C715013C04DC28" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7DDFD4F666C65699D0C715013C04DC28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_11EA55A80964931AC77215013C04B99D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7DDFD4F666C65699D0C715013C04DC28" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_11EA55A80964931AC77215013C04B99D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NotesPayableToBanksMember" xlink:label="loc_us-gaap_NotesPayableToBanksMember_31306644B9855D2976F515013C04D7E9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_11EA55A80964931AC77215013C04B99D" xlink:to="loc_us-gaap_NotesPayableToBanksMember_31306644B9855D2976F515013C04D7E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_F317FB3563320F598FD315013C04F369" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_11EA55A80964931AC77215013C04B99D" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_F317FB3563320F598FD315013C04F369" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_436EF888ED4893124E8C15013C05B97F" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:to="loc_us-gaap_DebtInstrumentAxis_436EF888ED4893124E8C15013C05B97F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_436EF888ED4893124E8C15013C05B97F" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_RevolvingLoansAndTermLoansMember" xlink:label="loc_asgn_RevolvingLoansAndTermLoansMember_7E28F7A8E94CDE120A8E15013C0504AC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_RevolvingLoansAndTermLoansMember_7E28F7A8E94CDE120A8E15013C0504AC" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_TermBLoanFacilitydueMay2020Member" xlink:label="loc_asgn_TermBLoanFacilitydueMay2020Member_7E5BF32CCCB4D9ABFB6415013C05161F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_TermBLoanFacilitydueMay2020Member_7E5BF32CCCB4D9ABFB6415013C05161F" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_RevolvingCreditFacilityDueMay2017Member" xlink:label="loc_asgn_RevolvingCreditFacilityDueMay2017Member_10C89F7F7FFBC8CC4C3115013C054E59" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_RevolvingCreditFacilityDueMay2017Member_10C89F7F7FFBC8CC4C3115013C054E59" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_TermALoanFacilityDueMay2017Member" xlink:label="loc_asgn_TermALoanFacilityDueMay2017Member_418171CA4172825F6CF215013C057E6C" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_TermALoanFacilityDueMay2017Member_418171CA4172825F6CF215013C057E6C" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_TermBLoanFacilityDueMay2019Member" xlink:label="loc_asgn_TermBLoanFacilityDueMay2019Member_697EE04C5E4D5308901B15013C05E4EA" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_TermBLoanFacilityDueMay2019Member_697EE04C5E4D5308901B15013C05E4EA" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_RevolvingCreditFacilitydueMay2018Member" xlink:label="loc_asgn_RevolvingCreditFacilitydueMay2018Member_E2D124C5855D7EC1CF3615013C05B389" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_RevolvingCreditFacilitydueMay2018Member_E2D124C5855D7EC1CF3615013C05B389" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_SeniorSecuredCreditAgreementMember" xlink:label="loc_asgn_SeniorSecuredCreditAgreementMember_F7108ADF293FD101105415013C06374E" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_SeniorSecuredCreditAgreementMember_F7108ADF293FD101105415013C06374E" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_TermALoansTermBLoansandRevolvingLoansMember" xlink:label="loc_asgn_TermALoansTermBLoansandRevolvingLoansMember_90E403228D192876726E15013C060D6B" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_TermALoansTermBLoansandRevolvingLoansMember_90E403228D192876726E15013C060D6B" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_TermALoanFacilitydueMay2018Member" xlink:label="loc_asgn_TermALoanFacilitydueMay2018Member_2144830C0C0D0EE5D66815013C0696B9" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_70DD90AD40ED48A994BA15013C058E59" xlink:to="loc_asgn_TermALoanFacilitydueMay2018Member_2144830C0C0D0EE5D66815013C0696B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_BE2983B95188444AFC9A15013C031726" xlink:to="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount" xlink:label="loc_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_90C789762A7515C717E615013C06E9E3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_90C789762A7515C717E615013C06E9E3" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LeverageRatioinLatestYearofDebtTerm" xlink:label="loc_asgn_LeverageRatioinLatestYearofDebtTerm_C8329994595966FD2DF615013C06C3EC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_asgn_LeverageRatioinLatestYearofDebtTerm_C8329994595966FD2DF615013C06C3EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_E6B856886E5971FDA2E315013C063326" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_E6B856886E5971FDA2E315013C063326" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_5105E88179AEF8A39CEF15013C0647D7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_5105E88179AEF8A39CEF15013C0647D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_10700B3CDF3FE80D87A015013C0638B5" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_10700B3CDF3FE80D87A015013C0638B5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_34477F0A4E81192A351815013C06F959" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_SecuredDebt_34477F0A4E81192A351815013C06F959" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_524DBB11B9F081C28C8C15013C065914" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_524DBB11B9F081C28C8C15013C065914" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_475BB4DB3DF395CAE56315013C07DBDA" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_475BB4DB3DF395CAE56315013C07DBDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateAtPeriodEnd" xlink:label="loc_us-gaap_DebtInstrumentInterestRateAtPeriodEnd_88C66BDC06AD33DDE62D15013C072D85" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_DebtInstrumentInterestRateAtPeriodEnd_88C66BDC06AD33DDE62D15013C072D85" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LeverageRatio" xlink:label="loc_asgn_LeverageRatio_66BE399381B9D2DE92B515013C07A1CB" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_asgn_LeverageRatio_66BE399381B9D2DE92B515013C07A1CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_DE91A8CD47AFA970D38C15013C079B89" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_DE91A8CD47AFA970D38C15013C079B89" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_Pledgedequityinterestinforeignsubsidiaries" xlink:label="loc_asgn_Pledgedequityinterestinforeignsubsidiaries_19D55621B85B245B235415013C07A827" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4950B9F639E5C8B952DE15013C06E594" xlink:to="loc_asgn_Pledgedequityinterestinforeignsubsidiaries_19D55621B85B245B235415013C07A827" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/LongTermDebtTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_1970587E114ED45ECEB7A8D2F3FBF940" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_2146ABDC66C2279AA4D8A8D2F3FB0591" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_1970587E114ED45ECEB7A8D2F3FBF940" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_2146ABDC66C2279AA4D8A8D2F3FB0591" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:label="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_7DD21C471E2B0B477B0BA8D2F3FBC79E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_1970587E114ED45ECEB7A8D2F3FBF940" xlink:to="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_7DD21C471E2B0B477B0BA8D2F3FBC79E" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/SegmentReporting" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_FEFE02D9A98CDAE33223A8D2F3D00629" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_ECE3C794CB4617FA925EA8D2F3D09D88" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_FEFE02D9A98CDAE33223A8D2F3D00629" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_ECE3C794CB4617FA925EA8D2F3D09D88" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/SegmentReportingReconciliationOfAssetsFromSegmentToConsolidatedDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_3CE0F270F4D9137D658DA8D2F3C10BF4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable" xlink:label="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_11E674B386B7429A1ED7A8D2F3C15A27" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_3CE0F270F4D9137D658DA8D2F3C10BF4" xlink:to="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_11E674B386B7429A1ED7A8D2F3C15A27" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_B00239199D9D5649025BA8D2F3C128A3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_11E674B386B7429A1ED7A8D2F3C15A27" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_B00239199D9D5649025BA8D2F3C128A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_B00239199D9D5649025BA8D2F3C128A3" xlink:to="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSegmentMember" xlink:label="loc_asgn_ApexSegmentMember_2E58444F0705217D748DA8D2F3C1F477" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:to="loc_asgn_ApexSegmentMember_2E58444F0705217D748DA8D2F3C1F477" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_OxfordSegmentMember" xlink:label="loc_asgn_OxfordSegmentMember_477DA2951D89D0444722A8D2F3C2D252" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:to="loc_asgn_OxfordSegmentMember_477DA2951D89D0444722A8D2F3C2D252" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LifeSciencesAndHealthcareSegmentMember" xlink:label="loc_asgn_LifeSciencesAndHealthcareSegmentMember_99F4A61E68BCC2BB2865A8D2F3C2FF62" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:to="loc_asgn_LifeSciencesAndHealthcareSegmentMember_99F4A61E68BCC2BB2865A8D2F3C2FF62" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_PhysicianSegmentMember" xlink:label="loc_asgn_PhysicianSegmentMember_7C99ADEFC39585C637C8A8D2F3C2D873" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_F0D02548CDD6E17B74F2A8D2F3C1F391" xlink:to="loc_asgn_PhysicianSegmentMember_7C99ADEFC39585C637C8A8D2F3C2D873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAssetReconcilingItemLineItems" xlink:label="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_45C5F8FBD58D5167730BA8D2F3C2F283" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTable_11E674B386B7429A1ED7A8D2F3C15A27" xlink:to="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_45C5F8FBD58D5167730BA8D2F3C2F283" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_032A1897BBD0866CC7DCA8D2F3C2BA5D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAssetReconcilingItemLineItems_45C5F8FBD58D5167730BA8D2F3C2F283" xlink:to="loc_us-gaap_Assets_032A1897BBD0866CC7DCA8D2F3C2BA5D" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/SegmentReportingRevenueByGeographicalAreasDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_E050F71F47F8E410D9CDA8D2F408D415" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract" xlink:label="loc_us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract_10685898242CCD70440BA8D2F40852FA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_E050F71F47F8E410D9CDA8D2F408D415" xlink:to="loc_us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract_10685898242CCD70440BA8D2F40852FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" xlink:label="loc_us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile_F710EEE3B6EAC4D96F3FA8D2F4085752" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract_10685898242CCD70440BA8D2F40852FA" xlink:to="loc_us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile_F710EEE3B6EAC4D96F3FA8D2F4085752" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" xlink:label="loc_us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries_68EEA11764CADD2B86A9A8D2F408E5DB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract_10685898242CCD70440BA8D2F40852FA" xlink:to="loc_us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries_68EEA11764CADD2B86A9A8D2F408E5DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_7277A0356302955A6970A8D2F40869D7" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GeographicAreasRevenuesFromExternalCustomersAbstract_10685898242CCD70440BA8D2F40852FA" xlink:to="loc_us-gaap_SalesRevenueServicesNet_7277A0356302955A6970A8D2F40869D7" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/SegmentReportingSegmentReportingInformationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_836D71525D972FAC48CFA8D2F3F660C1" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_D2F51496C3B16170615EA8D2F3F68499" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_836D71525D972FAC48CFA8D2F3F660C1" xlink:to="loc_us-gaap_NumberOfReportableSegments_D2F51496C3B16170615EA8D2F3F68499" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C21F820E997970403D56A8D2F3F68FA0" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_836D71525D972FAC48CFA8D2F3F660C1" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C21F820E997970403D56A8D2F3F68FA0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_A951863DCB41190601DCA8D2F3F6E4CE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C21F820E997970403D56A8D2F3F68FA0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_A951863DCB41190601DCA8D2F3F6E4CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_A951863DCB41190601DCA8D2F3F6E4CE" xlink:to="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_ApexSegmentMember" xlink:label="loc_asgn_ApexSegmentMember_D3EF5AAE30F6BF8506B1A8D2F3F6A9DD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:to="loc_asgn_ApexSegmentMember_D3EF5AAE30F6BF8506B1A8D2F3F6A9DD" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_OxfordSegmentMember" xlink:label="loc_asgn_OxfordSegmentMember_7F08A4E805BEB287A67DA8D2F3F6B26B" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:to="loc_asgn_OxfordSegmentMember_7F08A4E805BEB287A67DA8D2F3F6B26B" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_LifeSciencesSegmentMember" xlink:label="loc_asgn_LifeSciencesSegmentMember_742A15AB01380F0BB04EA8D2F3F6A691" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:to="loc_asgn_LifeSciencesSegmentMember_742A15AB01380F0BB04EA8D2F3F6A691" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_PhysicianSegmentMember" xlink:label="loc_asgn_PhysicianSegmentMember_F01E962B18E6C153A556A8D2F3F6E494" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:to="loc_asgn_PhysicianSegmentMember_F01E962B18E6C153A556A8D2F3F6E494" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_HealthcareSegmentMember" xlink:label="loc_asgn_HealthcareSegmentMember_D136AD10763D90D02BDAA8D2F3F7C527" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_0FF8226E4CF52FA400E2A8D2F3F602CD" xlink:to="loc_asgn_HealthcareSegmentMember_D136AD10763D90D02BDAA8D2F3F7C527" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C21F820E997970403D56A8D2F3F68FA0" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_5827402253A2A140E902A8D2F3F70ED4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_5827402253A2A140E902A8D2F3F70ED4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationRevenueAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationRevenueAbstract_AEFF50F7D6B47F5FFD3EA8D2F3F741E0" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:to="loc_us-gaap_SegmentReportingInformationRevenueAbstract_AEFF50F7D6B47F5FFD3EA8D2F3F741E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_9682A216C67AAF7AFFA7A8D2F3F7B4F9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_AEFF50F7D6B47F5FFD3EA8D2F3F741E0" xlink:to="loc_us-gaap_SalesRevenueServicesNet_9682A216C67AAF7AFFA7A8D2F3F7B4F9" xlink:type="arc" />
    <loc xlink:href="asgn-20130930.xsd#asgn_SegmentReportingInformationGrossProfitAbstract" xlink:label="loc_asgn_SegmentReportingInformationGrossProfitAbstract_93EB3AA2732BD7CB7673A8D2F3F7915D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:to="loc_asgn_SegmentReportingInformationGrossProfitAbstract_93EB3AA2732BD7CB7673A8D2F3F7915D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_5FB386C5F98537375AE6A8D2F3F7ECCE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_asgn_SegmentReportingInformationGrossProfitAbstract_93EB3AA2732BD7CB7673A8D2F3F7915D" xlink:to="loc_us-gaap_GrossProfit_5FB386C5F98537375AE6A8D2F3F7ECCE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_483A3CD220465DC0836BA8D2F3F72322" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75A549A773A34A9FA4DAA8D2F3F78530" xlink:to="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_483A3CD220465DC0836BA8D2F3F72322" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_6031578DD6AC59A16690A8D2F3F763F6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_483A3CD220465DC0836BA8D2F3F72322" xlink:to="loc_us-gaap_OperatingIncomeLoss_6031578DD6AC59A16690A8D2F3F763F6" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.onassignment.com/role/SegmentReportingTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_10F6ED41454EF6FAB3A2A8D2F410B95D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_CD79DE980C16F3889ABDA8D2F4112271" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_10F6ED41454EF6FAB3A2A8D2F410B95D" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_CD79DE980C16F3889ABDA8D2F4112271" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_C3947BB09D78524A737DA8D2F41134F6" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_10F6ED41454EF6FAB3A2A8D2F410B95D" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_C3947BB09D78524A737DA8D2F41134F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_CB9AAC3A5D5E8CD0C559A8D2F41178F6" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_10F6ED41454EF6FAB3A2A8D2F410B95D" xlink:to="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_CB9AAC3A5D5E8CD0C559A8D2F41178F6" xlink:type="arc" />
  </presentationLink>
</linkbase>
