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      <GrantsToDomesticIndividuals>
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        <ManagementAndGeneral>60558</ManagementAndGeneral>
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        <ManagementAndGeneral>48678</ManagementAndGeneral>
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        <ManagementAndGeneral>49736</ManagementAndGeneral>
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      <OtherExpenses>
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        <ProgramServices>276867</ProgramServices>
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        <ProgramServices>264994</ProgramServices>
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        <Description>FIELD TRIPS</Description>
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        <ProgramServices>264887</ProgramServices>
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      <TotalLiabilities>
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        <EOY>18917333</EOY>
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      <FollowSFAS117>X</FollowSFAS117>
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      <TemporarilyRestrictedNetAssets>
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        <EOY>3000</EOY>
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        <ContributorNameBusiness>
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        </ContributorNameBusiness>
        <ContributorAddressUS>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
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        <ReturnReference>PART II-B, LINE 1:</ReturnReference>
        <Explanation>THE INTERNATIONAL SCHOOL OF BOSTON BELONGS TO MEMBER ORGANIZATIONS, WHICH MAY ENGAGE IN LOBBYING ACTIVITIES. SOME PORTION OF MEMBERSHIP DUES MAY BE UTILIZED FOR LOBBYING ACTIVITIES.</Explanation>
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        <Explanation>THE SCHOOL QUALIFIES AS A TAX EXEMPT, NONPROFIT ORGANIZATION UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE (THE CODE) AND IS EXEMPT FROM FEDERAL AND STATE INCOME TAX ON RELATED INCOME PURSUANT TO SECTION 501(A) OF THE CODE. THE SCHOOL IS SUBJECT TO FEDERAL AND STATE INCOME TAXES ON UNRELATED BUSINESS INCOME, IF ANY. THE SCHOOL ACCOUNTS FOR UNCERTAIN TAX POSITIONS IN ACCORDANCE WITH FASB ASC TOPIC INCOME TAXES. THE TOPIC PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT PROCESS FOR FINANCIAL STATEMENT RECOGNITION OF UNCERTAIN TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. THE TOPIC ALSO PROVIDES GUIDANCE ON DERECOGNITION, CLASSIFICATION, INTEREST AND PENALTIES, ACCOUNTING IN INTERIM PERIODS, DISCLOSURE AND TRANSITION. AT JUNE 30, 2012, MANAGEMENT BELIEVES THAT THE SCHOOL HAS NO MATERIAL UNCERTAIN TAX POSITIONS. THE SCHOOL FILES INFORMATIONAL TAX RETURNS IN THE U.S. FEDERAL AND MASSACHUSETTS STATE JURISDICTIONS. WITH FEW EXCEPTIONS, THE SCHOOL IS NO LONGER SUBJECT TO U.S. FEDERAL AND STATE EXAMINATIONS BY TAX AUTHORITIES FOR YEARS BEFORE FISCAL YEAR 2009.</Explanation>
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        <ChangeInUseBondFinancedProp>0</ChangeInUseBondFinancedProp>
        <NonQualifiedBondRemedProcdrs>0</NonQualifiedBondRemedProcdrs>
      </Form990ScheduleKPartIII>
      <Form990ScheduleKPartIII>
        <BondReferenceCd>B</BondReferenceCd>
        <OwningBondFinancedProperty>0</OwningBondFinancedProperty>
        <AnyLeaseArrangements>0</AnyLeaseArrangements>
        <MngmentCntrctBondFinancdPrprty>0</MngmentCntrctBondFinancdPrprty>
        <AnyResearchAgreements>0</AnyResearchAgreements>
        <BondIssMeetPrvtSecurityPayTest>0</BondIssMeetPrvtSecurityPayTest>
        <ChangeInUseBondFinancedProp>0</ChangeInUseBondFinancedProp>
        <NonQualifiedBondRemedProcdrs>0</NonQualifiedBondRemedProcdrs>
      </Form990ScheduleKPartIII>
      <Form990ScheduleKPartIV>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiled>0</Form8038TFiled>
        <RebateNotDueYet>0</RebateNotDueYet>
        <ExceptionToRebate>1</ExceptionToRebate>
        <NoRebateDue>0</NoRebateDue>
        <VariableRateIssue>1</VariableRateIssue>
        <HedgeIdentifiedInBooksAndRecds>0</HedgeIdentifiedInBooksAndRecds>
        <GrossProceedsInvestedInGIC>0</GrossProceedsInvestedInGIC>
        <GrossProceedsInvested>0</GrossProceedsInvested>
        <WrittenProcToMonitorReqs>0</WrittenProcToMonitorReqs>
      </Form990ScheduleKPartIV>
      <Form990ScheduleKPartIV>
        <BondReferenceCd>B</BondReferenceCd>
        <Form8038TFiled>0</Form8038TFiled>
        <RebateNotDueYet>0</RebateNotDueYet>
        <ExceptionToRebate>1</ExceptionToRebate>
        <NoRebateDue>0</NoRebateDue>
        <VariableRateIssue>1</VariableRateIssue>
        <HedgeIdentifiedInBooksAndRecds>0</HedgeIdentifiedInBooksAndRecds>
        <GrossProceedsInvestedInGIC>0</GrossProceedsInvestedInGIC>
        <GrossProceedsInvested>0</GrossProceedsInvested>
        <WrittenProcToMonitorReqs>0</WrittenProcToMonitorReqs>
      </Form990ScheduleKPartIV>
    </IRS990ScheduleK>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>A COPY OF THE 990 IS PROVIDED TO THE BOARD OF TRUSTEES AND IS THOROUGHLY REVIEWED BEFORE IT IS FILED</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>THE POLICY IS REVIEWED AND UPDATED BY THE BOARD ANNUALLY.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>THE BOARD OF TRUSTEES DETERMINES THE COMPENSATION FOR THE HEAD OF SCHOOL AND CFO. BOTH EMPLOYEES HAVE WRITTEN CONTRACTS. BOTH OF THEIR SALARIES ARE REVIEWED BY THE BOARD ON AN ANNUAL BASIS, AND INCREASES OR ADJUSTMENTS, IF ANY, SHALL BE IN THE SOLE DISCRETION OF THE BOARD. ALL OTHER PERSONNEL SALARIES ARE DETERMINED BY THE HEAD OF SCHOOL WITH INPUT FROM THE CEO.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 18</ReturnReference>
        <Explanation>THE ORGANIZATION'S TAX FILINGS ARE AVAILABLE ONLINE FOR VIEWING AT WWW.GUIDESTAR.ORG, A WEBSITE USED TO RATE NON PROFITS FOR POTENTIAL DONORS. THE TAX FILINGS ARE ALSO AVAILABLE AT THE MASSACHUSETTS ATTORNEY GENERAL'S DIVISION FOR THE PUBLIC CHARITIES WEBSITE AND AT THE SCHOOL.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>THE ORGANIZATIONS FINANCIAL STATEMENTS ARE AVAILABLE ONLINE FOR VIEWING AT WWW.GUIDESTAR.ORG, A WESITE USED TO RATE NON-PROFITS FOR THE POTENTIAL DONORS. THE FINANCIAL STATEMENTS ARE ALSO AVAILABLE AT THE MASSACHUSETTS ATTORNEY GENERAL'S DIVISION FOR PUBLIC CHARITIES AND AT SCHOOL.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART XII, LINE 2C</Identifier>
        <Explanation>THERE HAVE BEEN NO CHANGES FROM THE PRIOR YEAR IN THE METHODS USED BY THE COMMITTEE RESPONSIBLE FOR OVERSIGHT OF THE AUDIT OF THE FINANCIAL STATEMENTS AND SELECTION OF AN INDEPENDENT ACCOUNTANT.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>