<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-04-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000726603</issuerCik>
        <issuerName>QUESTAR ASSESSMENT, INC.</issuerName>
        <issuerTradingSymbol>QUSA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001288497</rptOwnerCik>
            <rptOwnerName>NGUYEN CHRIS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8600 LASALLE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TOWSON</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21288</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Right to Buy Common Stock ($0.0001 par value)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.05</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-04-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-04-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Granted pursuant to the Company's 2007 Incentive Compensation Plan.</footnote>
        <footnote id="F2">Vest in three equal annual installments, on April 24, 2009, April 24, 2010, and April 24, 2011.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Chris L. Nguyen</signatureName>
        <signatureDate>2008-04-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2008-04-24
0
0000726603
QUESTAR ASSESSMENT, INC.
QUSA
0001288497
NGUYEN CHRIS
8600 LASALLE ROAD
TOWSON
MD
21288
1
0
0
0
Right to Buy Common Stock ($0.0001 par value)
2.05
2008-04-24
4
A
0
2500
0
A
2018-04-24
Common Stock
2500
2500
D
Granted pursuant to the Company's 2007 Incentive Compensation Plan.
Vest in three equal annual installments, on April 24, 2009, April 24, 2010, and April 24, 2011.
Chris L. Nguyen
2008-04-25