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      <NetUnrealizedGainsInvestments>363514</NetUnrealizedGainsInvestments>
      <DonatedSrvcAndUseOfFacilities>44902</DonatedSrvcAndUseOfFacilities>
      <RecoveriesOfPriorYearGrants>0</RecoveriesOfPriorYearGrants>
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      <RevenueNotRptdF990>224506</RevenueNotRptdF990>
      <RevenueSubtotal>24321606</RevenueSubtotal>
      <InvestmentExpensesNotIncluded>0</InvestmentExpensesNotIncluded>
      <OtherRevenuesNotIncluded>-634168</OtherRevenuesNotIncluded>
      <RevenueNotRptdOnFinStmt>-634168</RevenueNotRptdOnFinStmt>
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      <ExpensesNotRptdOnFinStmt>183910</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>24416127</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P02_S00_L09</Identifier>
        <ReturnReference>Schedule D, Part II, Line 9</ReturnReference>
        <Explanation>There is no revenue or expenses to report for the current year. The Lab School is only required to maintain it in its natural habitat.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P05_S00_L04</Identifier>
        <ReturnReference>Schedule D, Part V, Line 4</ReturnReference>
        <Explanation>Permanently restricted net assets are restricted to investment in perpetuity, the income from which is expendable to support.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L02d</Identifier>
        <ReturnReference>Schedule D, Part XII, Line 2d</ReturnReference>
        <Explanation>Scholarships</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XII, Line 4b</ReturnReference>
        <Explanation>Special events expenses (269,017) and rental expenses (365,151)</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L02d</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 2d</ReturnReference>
        <Explanation>Special event expenses (269,017) and rental expenses (365,151)</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 4b</ReturnReference>
        <Explanation>Scholarships</Explanation>
      </Form990ScheduleDPartXIV>
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    <IRS990ScheduleE documentId="R000005" softwareId="10000077" softwareVersion="v1.00">
      <NondiscriminatoryPolicyStmt>1</NondiscriminatoryPolicyStmt>
      <PolicyStatementInBrochuresEtc>1</PolicyStatementInBrochuresEtc>
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      <MaintRacialCompositionRecords>1</MaintRacialCompositionRecords>
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      <MaintCopiesOfAllSolicitations>1</MaintCopiesOfAllSolicitations>
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      <DiscriminateRaceAdmissPolicies>0</DiscriminateRaceAdmissPolicies>
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      <Form990ScheduleEPartII>
        <Identifier>SchE_P01_S00_L03</Identifier>
        <ReturnReference>Schedule E, Part I, Line 3</ReturnReference>
        <Explanation>Published annually in local newspapers in an advertisement that includes other schools in the Washington, D.C. area which belongs to the AISGW.</Explanation>
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    </IRS990ScheduleE>
    <IRS990ScheduleG documentId="R000006" softwareId="10000077" softwareVersion="v1.00">
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      <EmailSolicitations>X</EmailSolicitations>
      <PhoneSolicitations>X</PhoneSolicitations>
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      <SolicitationOfNonGovtGrants>X</SolicitationOfNonGovtGrants>
      <SolicitationOfGovtGrants>X</SolicitationOfGovtGrants>
      <SpecialFundraisingEvents>X</SpecialFundraisingEvents>
      <AgreementRefFundraising>1</AgreementRefFundraising>
      <FundraiserActivityInformation>
        <NameOfOrganization>
          <BusinessNameLine1>Florian Solutions</BusinessNameLine1>
        </NameOfOrganization>
        <AddressUS>
          <AddressLine1>3924 Benton Street NW</AddressLine1>
          <City>Washington</City>
          <State>DC</State>
          <ZIPCode>20007</ZIPCode>
        </AddressUS>
        <Activity>They provide professional fundraising for the Lab School of Washington, including grant writing.</Activity>
        <FundraiserControlOfFunds>0</FundraiserControlOfFunds>
        <GrossReceipts>227962</GrossReceipts>
        <AmountRetainedByContractor>9477</AmountRetainedByContractor>
        <NetToOrganization>218485</NetToOrganization>
      </FundraiserActivityInformation>
      <FundraiserActivityInformation>
        <NameOfOrganization>
          <BusinessNameLine1>Infograte Incorporated</BusinessNameLine1>
        </NameOfOrganization>
        <AddressUS>
          <AddressLine1>PO Box 559</AddressLine1>
          <City>Glen Echo</City>
          <State>MD</State>
          <ZIPCode>20812</ZIPCode>
        </AddressUS>
        <Activity>They advise, coordinate and assist in the annual giving campaign and the training of volunteers.</Activity>
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        <GrossReceipts>0</GrossReceipts>
        <AmountRetainedByContractor>13000</AmountRetainedByContractor>
        <NetToOrganization>-13000</NetToOrganization>
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      <TotalRetainedByContractors>22477</TotalRetainedByContractors>
      <TotalNetToOrganization>205485</TotalNetToOrganization>
      <LicensedStates>DC</LicensedStates>
      <LicensedStates>MD</LicensedStates>
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        <NameOfEvent1>Gala</NameOfEvent1>
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        <EntertainmentOtherEvents>0</EntertainmentOtherEvents>
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    <IRS990ScheduleI documentId="R000007" softwareId="10000077" softwareVersion="v1.00">
      <RecordsMaintained>1</RecordsMaintained>
      <Form990ScheduleIPartIII>
        <TypeOfGrant>Scholarships</TypeOfGrant>
        <NumberOfRecipients>33</NumberOfRecipients>
        <AmountOfCashGrant>0</AmountOfCashGrant>
        <AmountOfNonCashAssistance>183910</AmountOfNonCashAssistance>
        <MethodOfValuation>FMV</MethodOfValuation>
        <DescriptionOfNonCashAssistance>Tuition reduction</DescriptionOfNonCashAssistance>
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      <Form990ScheduleIPartIV>
        <Identifier>SchI_P01_S00_L02</Identifier>
        <ReturnReference>Schedule I, Part I, Line 2</ReturnReference>
        <Explanation>The Lab School of Washington asks that parents attach to their child's application a letter which outlines the reasons for the scholarship requests. Parents typically explain any special circumstances that might be applicable to their family. Additionally, the Lab School asks parents to indicate what contribution they would be able to make towards the summer school tuition. Finally, the director, the admissions director, and the division heads review the requests for scholarship assistance and prioritize the list. The Lab School tries to extend scholarships to as many low income families as possible, inner city families, and those who, without substantial financial assistance, could not afford to send their child to the summer program. Scholarships are awarded until all the designated funds have been depleted.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
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      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
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      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <CompBasedOnRevenueOfFilingOrg>0</CompBasedOnRevenueOfFilingOrg>
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      <CompBasedNetEarningsRelateOrgs>0</CompBasedNetEarningsRelateOrgs>
      <AnyNonFixedPayments>0</AnyNonFixedPayments>
      <InitialContractException>0</InitialContractException>
      <Form990ScheduleJPartII>
        <NamePerson>Katherine Schantz</NamePerson>
        <BaseCompensationFilingOrg>260294</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
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        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>13581</DeferredCompFilingOrg>
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      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>10</NumberOfContributions>
        <NoncashContribsRptdF990>87481</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </SecuritiesPubliclyTraded>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Software</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>70200</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Construction contractor</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>31000</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Architect fees</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>12000</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <NumberOf8283Received>0</NumberOf8283Received>
      <AnyPropertyThatMustBeHeld>0</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>1</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>1</ThirdPartiesUsed>
      <Form990ScheduleMPartII>
        <Identifier>SchM_P01_S00_L32b</Identifier>
        <ReturnReference>Schedule M, Part I, Line 32b</ReturnReference>
        <Explanation>The organization hires a consultant to manage the grant plan for funders including corporate giving and foundation and to write grant proposals for new corporate and foundation funding opportunities.</Explanation>
      </Form990ScheduleMPartII>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000010" softwareId="10000077" softwareVersion="v1.00">
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L02</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 2</ReturnReference>
        <Explanation>Richard Meltzer the HS Coordinator is married to Diana Melzer the Associate Head of School.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L04</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 4</ReturnReference>
        <Explanation>Bylaws exceed 9,000 characters, therefore The Lab School will mail in the bylaw changes.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L07a</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 7a</ReturnReference>
        <Explanation>The nominating committee recommends to the full Board candidates for election.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L11a</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 11a</ReturnReference>
        <Explanation>A copy was provided to the Audit Committee which reviewed in detail the Form 990 and recommended its approval and final filing to the Finance Committee and The Chairman of the Board. The Finance Committee reports to the Board and advises that a complete copy can be reviewed in the business office before the filing date. As of December 31, 2011 the 990 will be posted on The Lab School of Washington's Trustee site.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L12c</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 12c</ReturnReference>
        <Explanation>The School has a history of complying with required new compliance regulations. The Finance Committee has adopted numerous policies over the last 10 years. Management reviews annually, all policies that the 990 questions during the annual audit.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L15</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 15</ReturnReference>
        <Explanation>At least every 2 years, The Lab School compares salaries of other private schools, teacher salaries in local jurisdictions and we also use prior year Abbott, Langer Association Surveys' All Non-Profits Salary Survey. In checking all of the above resources, we've determined that our salaries are generally 5%-10% below the median salaries.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0C_L19</Identifier>
        <ReturnReference>Form 990, Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The Lab School follows the public viewing policy required under the Freedom of Information Act. In addition, all policies listed in Part VI, Line 18 are available for public viewing.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P11_S00_L05</Identifier>
        <ReturnReference>Form 990, Part XI, Line 5</ReturnReference>
        <Explanation>Unrealized gain/loss on investments $363,514 and in-kind donation for services $44,902.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>