<SEC-DOCUMENT>0001123292-18-000419.txt : 20180227
<SEC-HEADER>0001123292-18-000419.hdr.sgml : 20180227
<ACCEPTANCE-DATETIME>20180227200756
ACCESSION NUMBER:		0001123292-18-000419
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180223
FILED AS OF DATE:		20180227
DATE AS OF CHANGE:		20180227

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ramirez, Roberto A
		CENTRAL INDEX KEY:			0001409248

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-48123
		FILM NUMBER:		18647678

	MAIL ADDRESS:	
		STREET 1:		ANSWERTHINK, INC.
		STREET 2:		1001 BRICKELL DRIVE, SUITE 3000
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33131

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HACKETT GROUP, INC.
		CENTRAL INDEX KEY:			0001057379
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
		IRS NUMBER:				650750100
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1228

	BUSINESS ADDRESS:	
		STREET 1:		1001 BRICKELL BAY DRIVE
		STREET 2:		SUITE 3000
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33131
		BUSINESS PHONE:		3053758005

	MAIL ADDRESS:	
		STREET 1:		1001 BRICKELL BAY DRIVE
		STREET 2:		SUITE 3000
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33131

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ANSWERTHINK INC
		DATE OF NAME CHANGE:	20000628

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ANSWERTHINK CONSULTING GROUP INC
		DATE OF NAME CHANGE:	19980608
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-02-23</periodOfReport>

    <issuer>
        <issuerCik>0001057379</issuerCik>
        <issuerName>HACKETT GROUP, INC.</issuerName>
        <issuerTradingSymbol>HCKT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001409248</rptOwnerCik>
            <rptOwnerName>Ramirez, Roberto A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE HACKETT GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1001 BRICKELL BAY DRIVE, SUITE 3000</rptOwnerStreet2>
            <rptOwnerCity>MIAMI</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33131</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-02-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7913</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.34</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>158462</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-02-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>15000</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.34</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>143462</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The shares were delivered by the reporting person in satisfaction of withholding taxes in connection with the recent vesting of certain restricted stock units (RSUs) acquired through prior grants, as permitted under the Hackett Group, Inc.'s 1998 Stock Option and Incentive Plan.</footnote>
        <footnote id="F2">Includes 29,301 unvested RSUs. Excludes 100,000 vested performance-based stock options with an exercise price of $4.00.</footnote>
        <footnote id="F3">The proceeds from the sale of these shares are to be used in part by the reporting person to cover estimated tax liabilities associated with previously vested restricted stock units (RSUs). Exempt disposition to the issuer pursuant to Rule 16b-3(e).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Frank A. Zomerfeld, Attorney-in-Fact</signatureName>
        <signatureDate>2018-02-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
