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      <Form990PartVIISectionAGrp>
        <PersonNm>MARTHA BRIDGE DENCKLA</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KATHRYN HAMM</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SHENEARAH LASSITER</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL MILLER</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>1374577</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>139389</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>9</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>false</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>true</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
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      <ContractorCompensationGrp>
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      <ProgramServiceRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <NetIncmFromFundraisingEvtGrp>
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      <CompCurrentOfcrDirectorsGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <InvestmentExpensesNotIncldAmt>31869</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>-160343</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>-128474</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>160343</ExpensesNotReportedAmt>
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      <InvestmentExpensesNotIncld2Amt>31869</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>31869</ExpensesNotRptFinclStmtAmt>
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        <FormAndLineReferenceDesc>Pt II, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE IS NO REVENUE OR EXPENSE TO REPORT FOR THE CURRENT YEAR. THE LAB SCHOOL IS ONLY REQUIRED TO MAINTAIN IT IN ITS NATURAL HABITAT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt IV, Line 1b</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT EXPENSES ARE $160,343</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>PERMANENTLY RESTRICTED NET ASSETS ARE RESTRICTED TO INVESTMENT IN PERPETUITY, THE INCOME FROM WHICH IS EXPENDABLE TO SUPPORT GENERAL OPERATIONS, FINANCIAL AID AND PROFESSIONAL DEVELOPMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
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        <ExplanationTxt>MANAGEMENT EVALUATES UNCERTAINTY IN INCOME TAX POSITIONS BASED ON A MORE-LIKELY-THAN-NOT RECOGNITION STANDARD. IF THAT THRESHOLD IS MET, THE TAX POSITION IS MEASURED AT THE LARGEST AMOUNT THAT IS GREATER THAN 50% LIKELY OF BEING REALIZED UPON ULTIMATE SETTLEMENT. AS OF JUNE 30, 2023, THERE ARE NO ACCRUALS FOR UNCERTAIN TAX POSITIONS. IF APPLICABLE, THE SCHOOL RECORDS INTEREST AND PENALTIES AS A COMPONENT OF INCOME TAX EXPENSE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2d</FormAndLineReferenceDesc>
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      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XI, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT EXPENSES ($160,343) NETTED WITH REVENUE IN PART VIII</ExplanationTxt>
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        <ExplanationTxt>PUBLISHED ANNUALLY IN LOCAL NEWSPAPERS IN AN ADVERTISEMENT PUBLISHED BY THE ASSOCIATION OF INDEPENDENT SCHOOLS OF GREATER WASHINGTON. PUBLISHED ANNUALLY IN LOCAL NEWSPAPERS IN AN ADVERTISEMENT PUBLISHED BY THE ASSOCIATION OF INDEPENDENT SCHOOLS OF GREATER WASHINGTON.</ExplanationTxt>
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      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>165491</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt I Line 1b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE HOUSING ALLOWANCE IS PART OF THE HEAD OF SCHOOL'S CONTRACT. NO WRITTEN POLICY RELATING TO PAYMENT OR REIMBURSEMENT IS IN PLACE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUDITED FINANCIAL STATEMENTS WERE PRESENTED TO THE AUDIT COMMITTEE OF THE BOARD BY THE INDEPENDENT OUTSIDE AUDITORS. THE MATERIALS WERE REVIEWED IN DETAIL AND THEN PRESENTED BY THE AUDIT CHAIR TO BOTH THE FINANCE COMMITTEE AND DIRECTLY TO THE BOARD OF TRUSTEES WHO ACCEPTED THE REPORT. THE FINALIZED 990 WAS POSTED TO THE BOARD PORTAL PRIOR TO BEING FILED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, THE SCHOOL'S AUDIT COMMITTEE REVIEWS THE DISCLOSURES IN ORDER TO DETERMINE WHETHER A CONFLICT OF INTEREST EXISTS AND WHETHER OR NOT SUCH A CONFLICT MATERIALLY AND ADVERSELY AFFECTS THE INTERESTS OF THE SCHOOL. THE INDIVIDUAL WITH THE CONFLICT MAY NOT PARTICIPATE IN SUCH DETERMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>AT LEAST EVERY TWO YEARS, THE LAB SCHOOL OF WASHINGTON COMPARES SALARIES OF TEACHERS AND ADMINISTRATORS TO CORRESPONDING ROLES IN COMPARABLE INDEPENDENT SCHOOLS IN THE REGION, AND COMPARABLE SPECIAL NEEDS SCHOOLS NATIONALLY. IT IS THE GOAL OF THE SCHOOL TO REACH THE MEDIAN OF COMPARABLE SCHOOLS ALTHOUGH THAT HAS NOT BEEN ACHIEVED YET.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>AT LEAST EVERY TWO YEARS, THE LAB SCHOOL OF WASHINGTON COMPARES SALARIES OF TEACHERS AND ADMINISTRATORS TO CORRESPONDING ROLES IN COMPARABLE INDEPENDENT SCHOOLS IN THE REGION, AND COMPARABLE SPECIAL NEEDS SCHOOLS NATIONALLY. IT IS THE GOAL OF THE SCHOOL TO REACH THE MEDIAN OF COMPARABLE SCHOOLS ALTHOUGH THAT HAS NOT BEEN ACHIEVED YET.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL FOLLOWS THE PUBLIC VIEWING POLICY REQUIRED UNDER THE FREEDOM OF INFORMATION ACT. IN ADDITION, ALL POLICIES LISTED IN PART VI, LINE 19 ARE AVAILABLE FOR PUBLIC VIEWING.</ExplanationTxt>
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</Return>
