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    <link:label id="lab_asgn_RangeOneMember_BD4A54B18AFF4CB41E6FD7464FDFCB7C_label_en-US" xlink:label="lab_asgn_RangeOneMember_BD4A54B18AFF4CB41E6FD7464FDFCB7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range One [Member]</link:label>
    <link:label id="lab_asgn_RangeOneMember_BD4A54B18AFF4CB41E6FD7464FDFCB7C_documentation_en-US" xlink:label="lab_asgn_RangeOneMember_BD4A54B18AFF4CB41E6FD7464FDFCB7C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Range One [Member]</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_RangeOneMember" xlink:label="loc_asgn_RangeOneMember_BD4A54B18AFF4CB41E6FD7464FDFCB7C" xlink:type="locator" />
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    <link:label id="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542_terseLabel_en-US" xlink:label="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leverage Ratio Less Than 3 but Greater Than or Equal to 2</link:label>
    <link:label id="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542_label_en-US" xlink:label="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range Two [Member]</link:label>
    <link:label id="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542_documentation_en-US" xlink:label="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Range Two [Member]</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_RangeTwoMember" xlink:label="loc_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:to="lab_asgn_RangeTwoMember_B7200041DEA2600F8C75D7464FDFD542" xlink:type="arc" />
    <link:label id="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5_terseLabel_en-US" xlink:label="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leverage Ratio Less Than 2</link:label>
    <link:label id="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5_label_en-US" xlink:label="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range Three [Member]</link:label>
    <link:label id="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5_documentation_en-US" xlink:label="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Range Three [Member]</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_RangeThreeMember" xlink:label="loc_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:to="lab_asgn_RangeThreeMember_DB0EB9B86A51D533B326D7464FDFFED5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link: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_22CE5A8CAD85BCE76DDCD7464FDF673B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B" xlink:to="lab_us-gaap_DebtInstrumentLineItems_22CE5A8CAD85BCE76DDCD7464FDF673B" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Secured Debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135_label_en-US" xlink:label="lab_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link: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_A89996C5258E1C67BA3DD7464FDF9135" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135" xlink:to="lab_us-gaap_SecuredDebt_A89996C5258E1C67BA3DD7464FDF9135" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Face amount of term loan</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link: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_BCE936A2655622E5F6DAD7464FE559B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_BCE936A2655622E5F6DAD7464FE559B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, maximum borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link: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_3D9CB40B9F1400D958E4D7464FE501A0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_3D9CB40B9F1400D958E4D7464FE501A0" xlink:type="arc" />
    <link:label id="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE_terseLabel_en-US" xlink:label="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term of instrument</link:label>
    <link:label id="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE_label_en-US" xlink:label="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term of Instrument</link:label>
    <link:label id="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE_documentation_en-US" xlink:label="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term of Instrument</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_DebtInstrumentTermOfInstrument" xlink:label="loc_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:to="lab_asgn_DebtInstrumentTermOfInstrument_7221C908AE831E19617DD7464FE509BE" xlink:type="arc" />
    <link:label id="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A_terseLabel_en-US" xlink:label="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letter of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A_label_en-US" xlink:label="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A_documentation_en-US" xlink:label="lab_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the borrowing facility for letters of credit.</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_asgn_LetterOfCreditMaximumBorrowingCapacity_EF99CA1BB85B9A3925E4D74654D2616A" xlink:type="locator" />
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    <link:label id="lab_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_C3650AC4FA4642D816E6D7464FE59363_terseLabel_en-US" xlink:label="lab_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_C3650AC4FA4642D816E6D7464FE59363" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase to borrowing capacity available under credit facility</link:label>
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    <link:label id="lab_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_C3650AC4FA4642D816E6D7464FE59363_documentation_en-US" xlink:label="lab_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_C3650AC4FA4642D816E6D7464FE59363" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Increase in Additional Principal Amount</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount" xlink:label="loc_asgn_LineOfCreditFacilityIncreaseInAdditionalPrincipalAmount_C3650AC4FA4642D816E6D7464FE59363" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_D71929DC1B08EB63911DD7464FE58DE6_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_D71929DC1B08EB63911DD7464FE58DE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Description of variable rate basis</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_D71929DC1B08EB63911DD7464FE58DE6_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_D71929DC1B08EB63911DD7464FE58DE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Description of Variable Rate Basis</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_0497ED6A1E02AE80E3ACD7464FE58865_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_0497ED6A1E02AE80E3ACD7464FE58865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis spread on variable rate borrowings</link:label>
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    <link: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_0497ED6A1E02AE80E3ACD7464FE58865" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, unused portion, commitment fee percentage</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link: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_F25E4C4B4890667ADFA4D7464FE591B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3" xlink:to="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_F25E4C4B4890667ADFA4D7464FE591B3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_1BBBCBC09000B4592E68D7464FE5BB55_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_1BBBCBC09000B4592E68D7464FE5BB55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Frequency of amortization payment</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_1BBBCBC09000B4592E68D7464FE5BB55_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_1BBBCBC09000B4592E68D7464FE5BB55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Frequency of Periodic Payment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" xlink:label="loc_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_1BBBCBC09000B4592E68D7464FE5BB55" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1E3BBE52E3BB2F9E7468928361954D1E_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1E3BBE52E3BB2F9E7468928361954D1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value by Liability Class [Domain]</link:label>
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    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_25598B67FD965DF6E90F928361951A32_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_25598B67FD965DF6E90F928361951A32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_25598B67FD965DF6E90F928361951A32_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_25598B67FD965DF6E90F928361951A32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
    <link: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_25598B67FD965DF6E90F928361951A32" xlink:type="locator" />
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    <link: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_EB045D1F9827366B3DDD92836195CD14" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_949F6182D49F011BE3D892836195902B_periodStartLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_949F6182D49F011BE3D892836195902B" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at beginning of period</link:label>
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    <link: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_949F6182D49F011BE3D892836195902B" xlink:type="locator" />
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    <link:loc xlink:href="asgn-20120930.xsd#asgn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAcquisitions" xlink:label="loc_asgn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAcquisitions_8BAD93E3C129350E5AB99283619518EF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_EB8586D9DD3577F382C6D1F8746AD4C3" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2014</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_0055AB277811D5842CDAD1F8746ACFCB" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_5C8032285EBAC29E8BF5D1F8746A92D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C67FC22EE25618956CDD1F8746A90D5" xlink:type="arc" />
    <link:label id="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486_terseLabel_en-US" xlink:label="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486_label_en-US" xlink:label="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due After Four Years</link:label>
    <link:label id="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486_documentation_en-US" xlink:label="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due After Four Years</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears" xlink:label="loc_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:to="lab_asgn_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears_B23DD370B71542BB9168D1F8746AB486" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2082EB1E22E44E71AE8BD1F8746A69C0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherCommitmentFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13" xlink:to="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_039F7193180A18653031D1F8746A2C13" xlink:type="arc" />
    <link:label id="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD_terseLabel_en-US" xlink:label="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2012</link:label>
    <link:label id="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD_label_en-US" xlink:label="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Remainder of Fiscal Year</link:label>
    <link:label id="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD_documentation_en-US" xlink:label="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_OtherCommitmentDueInRemainderOfFiscalYear" xlink:label="loc_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:to="lab_asgn_OtherCommitmentDueInRemainderOfFiscalYear_28A1ECE2908FA2F0D61CD1F8746A0ADD" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherCommitmentDueInNextTwelveMonths" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13" xlink:to="lab_us-gaap_OtherCommitmentDueInNextTwelveMonths_2C1C1E64332030E08A6BD1F8746ACD13" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2014</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Second Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherCommitmentDueInSecondYear" xlink:label="loc_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906" xlink:to="lab_us-gaap_OtherCommitmentDueInSecondYear_B36D189568B6F5F171DFD1F8746B0906" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment, Due in Third Year</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45" xlink:to="lab_us-gaap_OtherCommitmentDueInThirdYear_1E48A5E34E783AA87F8AD1F8746B9E45" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentDueInFourthYear_2B471DE0AB16471B7FE5D1F8746BB076_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentDueInFourthYear_2B471DE0AB16471B7FE5D1F8746BB076" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
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    <link:label id="lab_asgn_OtherCommitmentDueAfterFourthYear_861E647CE5B8451E6679D1F8746B48C8_terseLabel_en-US" xlink:label="lab_asgn_OtherCommitmentDueAfterFourthYear_861E647CE5B8451E6679D1F8746B48C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
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    <link:label id="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_6AA7F7D1D3695A99B9A2DC92F6C2EB47_documentation_en-US" xlink:label="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_6AA7F7D1D3695A99B9A2DC92F6C2EB47" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net change of the provision for obligations and payables pertaining to claims incurred of a workers compensation and medical malpractice provision.</link:label>
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    <link:label id="lab_asgn_LifeSciencesSegmentMember_96BF677CF99E9B13402F9283603DA899_terseLabel_en-US" xlink:label="lab_asgn_LifeSciencesSegmentMember_96BF677CF99E9B13402F9283603DA899" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Life Sciences</link:label>
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    <link:label id="lab_asgn_LifeSciencesSegmentMember_96BF677CF99E9B13402F9283603DA899_documentation_en-US" xlink:label="lab_asgn_LifeSciencesSegmentMember_96BF677CF99E9B13402F9283603DA899" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Life Sciences Segment [Member]</link:label>
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    <link:label id="lab_asgn_HealthcareSegmentMember_4869D4DC8E853A9E66EF9283603DDF5B_terseLabel_en-US" xlink:label="lab_asgn_HealthcareSegmentMember_4869D4DC8E853A9E66EF9283603DDF5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Healthcare</link:label>
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    <link:loc xlink:href="asgn-20120930.xsd#asgn_HealthcareSegmentMember" xlink:label="loc_asgn_HealthcareSegmentMember_4869D4DC8E853A9E66EF9283603DDF5B" xlink:type="locator" />
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    <link:loc xlink:href="asgn-20120930.xsd#asgn_PhysicianSegmentMember" xlink:label="loc_asgn_PhysicianSegmentMember_C4B0CFC6C262EC1147809283603D5B38" xlink:type="locator" />
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    <link:label id="lab_asgn_HealthCarePartnersMember_6E939359DF34DFE4FA4C9283603D52C8_terseLabel_en-US" xlink:label="lab_asgn_HealthCarePartnersMember_6E939359DF34DFE4FA4C9283603D52C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">HCP</link:label>
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    <link:loc xlink:href="asgn-20120930.xsd#asgn_HealthCarePartnersMember" xlink:label="loc_asgn_HealthCarePartnersMember_6E939359DF34DFE4FA4C9283603D52C8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Name</link:label>
    <link:label id="lab_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link: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_0C983ADC31AE283D01FBD215F7754E45" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45" xlink:to="lab_us-gaap_PlanNameDomain_0C983ADC31AE283D01FBD215F7754E45" xlink:type="arc" />
    <link:label id="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5_terseLabel_en-US" xlink:label="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2010 Employee Stock Purchase Plan (ESPP)</link:label>
    <link:label id="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5_label_en-US" xlink:label="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan [Member]</link:label>
    <link:label id="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5_documentation_en-US" xlink:label="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_EmployeeStockPurchasePlanMember" xlink:label="loc_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:to="lab_asgn_EmployeeStockPurchasePlanMember_5A040016811C02540FDED215F77514C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Compensation Arrangement with Individual, Share-based Payments</link:label>
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]</link:label>
    <link: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_48210F890927541B550AD215F775F401" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401" xlink:to="lab_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_48210F890927541B550AD215F775F401" xlink:type="arc" />
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF_terseLabel_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, grant date fair market value</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF_label_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF_documentation_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue" xlink:label="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:to="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_B06A03423247D63B0F93D215F7753FFF" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards expense, service period</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_B55276CB84A0F692E6D1D215F775FD30" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_84AF945F33DEF6727AC8D215F775BFED_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_84AF945F33DEF6727AC8D215F775BFED" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Liability for share-based awards</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_84AF945F33DEF6727AC8D215F775BFED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_84AF945F33DEF6727AC8D215F775BFED" xlink:to="lab_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_84AF945F33DEF6727AC8D215F775BFED" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, grants in period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
    <link: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_A2D42835354260649548D215F7754229" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A2D42835354260649548D215F7754229" xlink:type="arc" />
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE_terseLabel_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, number of equal vesting components</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE_label_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-Based Payment Award, Number of Equal Vesting Components</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE_documentation_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-Based Payment Award, Number of Equal Vesting Components</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents" xlink:label="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:to="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingComponents_407AFC50A40DD2F340B9D215F77517CE" xlink:type="arc" />
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC_terseLabel_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, amount of equal vesting components</link:label>
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC_label_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Payment Award, Equity Instrument Other Than Options, Vesting Component</link:label>
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC_documentation_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based payment award, equity instrument other than options, amount of vesting component</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent" xlink:label="loc_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:to="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestingComponent_470EFEB3978AFE6EDA60D215F77541AC" xlink:type="arc" />
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2_terseLabel_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, amount of final vesting component</link:label>
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2_label_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Payment Award Equity Instrument Other Than Options Final Vesting Component</link:label>
    <link:label id="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2_documentation_en-US" xlink:label="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Based Payment Award Equity Instrument Other Than Options Final Vesting Component</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent" xlink:label="loc_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:to="lab_asgn_ShareBasedPaymentAwardEquityInstrumentOtherThanOptionsFinalVestingComponent_3F53B2D2609C8F91A959D215F77549F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee stock purchase plan shares issued during period</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Employee Stock Purchase Plans</link:label>
    <link: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_5E2E66C4C16E66F9930ED215F7752E0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_5E2E66C4C16E66F9930ED215F7752E0B" xlink:type="arc" />
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280_terseLabel_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based awards, vesting percentage in year one</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280_label_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage, Year One</link:label>
    <link:label id="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280_documentation_en-US" xlink:label="lab_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of a share-based payment award that vests in year one.</link:label>
    <link:loc xlink:href="asgn-20120930.xsd#asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne" xlink:label="loc_asgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageYearOne_33CDA6C94191CF82A3FDD215F7754280" xlink:type="locator" />
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