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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Hall Davidson</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Thuan Nguygen</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ruth Okoye</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Cecilia Rodriguez Alcala</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Julianne Ross-Kleinmann</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ed Snow</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Christine Terry</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Wegner</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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          <USAddress>
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            <StateAbbreviationCd>IL</StateAbbreviationCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Cordia Partners</PersonNm>
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        <ContractorAddress>
          <USAddress>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>davies dixon</PersonNm>
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          <USAddress>
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      <TotalContributionsAmt>7815767</TotalContributionsAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>541900</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>1674663</RelatedOrExemptFuncIncomeAmt>
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      </InvestmentIncomeGrp>
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      </IncmFromInvestBondProceedsGrp>
      <RoyaltiesRevenueGrp>
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        <ExclusionAmt>161722</ExclusionAmt>
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        <PersonalAmt>0</PersonalAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>11771213</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
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      <NetGainOrLossInvestmentsGrp>
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      <FundraisingDirectExpensesAmt>0</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncmFromFundraisingEvtGrp>
      <GamingGrossIncomeAmt>0</GamingGrossIncomeAmt>
      <GamingDirectExpensesAmt>0</GamingDirectExpensesAmt>
      <NetIncomeFromGamingGrp>
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        <RelatedOrExemptFuncIncomeAmt>282444</RelatedOrExemptFuncIncomeAmt>
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        <Desc>ADVERTISING FEES</Desc>
        <BusinessCd>541800</BusinessCd>
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        <UnrelatedBusinessRevenueAmt>725632</UnrelatedBusinessRevenueAmt>
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      <OtherRevenueMiscGrp>
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      <OtherRevenueMiscGrp>
        <Desc>MAILING LIST RENTAL</Desc>
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        <UnrelatedBusinessRevenueAmt>12081</UnrelatedBusinessRevenueAmt>
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      <GrantsToDomesticIndividualsGrp>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>270496</ManagementAndGeneralAmt>
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      <FeesForServicesLobbyingGrp>
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        <FundraisingAmt>0</FundraisingAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ProgramServicesAmt>124864</ProgramServicesAmt>
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        <FundraisingAmt>0</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>BAD DEBT</Desc>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>375</ProgramServicesAmt>
        <ManagementAndGeneralAmt>34199</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>7379</ProgramServicesAmt>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>8508315</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7397084</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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        <EOYAmt>1843875</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>30248</EOYAmt>
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        <EOYAmt>2750000</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>877919</EOYAmt>
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        <EOYAmt>0</EOYAmt>
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      <RcvblFromDisqualifiedPrsnGrp>
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        <EOYAmt>0</EOYAmt>
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      <OthNotesLoansReceivableNetGrp>
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        <EOYAmt>0</EOYAmt>
      </OthNotesLoansReceivableNetGrp>
      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>271678</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>358787</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>3150146</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>2167611</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
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        <EOYAmt>982535</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
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        <EOYAmt>14405317</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <InvestmentsOtherSecuritiesGrp>
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        <EOYAmt>0</EOYAmt>
      </InvestmentsOtherSecuritiesGrp>
      <InvestmentsProgramRelatedGrp>
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        <EOYAmt>0</EOYAmt>
      </InvestmentsProgramRelatedGrp>
      <IntangibleAssetsGrp>
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        <ExplanationTxt>Tax positions taken related to ISTE's tax exempt status, unrelated business activities, taxable income and deductibility of expenses and other miscellaneous tax positions have been reviewed, and management is of the opinion that material positions taken by ISTE would more likely than not be sustained by examination. Accordingly, ISTE has not recorded an income tax liability for uncertain tax benefits as of December 31, 2020. Management has concluded that no reserve for uncertain tax positions is required as of December 31, 2020, and no material change is anticipated in the twelve months following the period ended December 31, 2020. Generally, ISTE is no longer subject to income tax examinations by the U.S. federal, state or local tax authorities for years prior to December 31, 2017.</ExplanationTxt>
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        <TitleTxt>Chief Learning Officer</TitleTxt>
        <BaseCompensationFilingOrgAmt>193600</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>2037</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>5576</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>12800</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>214013</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4D:</FormAndLineReferenceDesc>
        <ExplanationTxt>Provide educators with resources to understanding federal and state education resources. FORM 990, Part VI, Section A, Line 6: ISTE MEMBERSHIP INCLUDED INDIVIDUAL MEMBERSHIPS, GROUP MEMBERSHIP, AND CORPORATE MEMBERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7a:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD NOMINATES CANDIDATES WHO ARE MEMBERS IN GOOD STANDING. MEMBERS VOTE FOR CANDIDATES ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, Part VI, Section B, Line 11b:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ISTE AUDIT/TAX FIRM AND THE ISTE FINANCE TEAM WORK TOGETHER TO GATHER THE REQUIRED INFORMATION NECESSARY TO COMPLETE THE FORM 990. THE TAX FIRM PREPARES AN INITIAL DRAFT FORM 990 AND REVIEWS THIS INITIAL DRAFT WITH THE ISTE FINANCE TEAM. ALL LINE ITEMS ARE REVIEWED AND ANY ITEMS IN QUESTION ARE DISCUSSED ANY RECOMMENDED CHANGES AND COMMENTS ARE CONSIDERED AND THE FORM 990 IS UPDATED. THE FINAL DRAFT FORM 990 IS THEN MADE AVAILABLE TO THE ISTE AUDIT COMMITTEE FOR REVIEW AND COMMENTS PRIOR TO THE FILING OF THE RETURN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, Part VI, Section B, Line 12c:</FormAndLineReferenceDesc>
        <ExplanationTxt>ISTE HAS POLICIES IN PLACE THAT GOVERN CONFLICTS OF INTEREST AS IT RELATES TO BOARD MEMBERS, BOARD OFFICERS, THE CEO, AND STAFF IN DETERMINING A CONFLICT OF INTEREST OF A BOARD MEMBER. THE BOARD SHALL VOTE AS TO WHETHER A CONFLICT IS PRESENT, AND THE VOTE OF THE BOARD SHALL BE FINAL. THE INDIVIDUAL WITH A POTENTIAL CONFLICT OF INTEREST SHALL NOT VOTE IN THE CASE OF A DISCLOSED CONFLICT OF INTEREST. THE BOARD WILL PERFORM DUE DILIGENCE TO DETERMINE HOW TO HANDLE EACH DISCLOSED CONFLICT FOR BOARD MEMBERS AND THE CEO IN THE EVENT OF A VIOLATION. THE BOARD WILL DETERMINE ANY APPROPRIATE CORRECTIVE OR DISCIPLINARY ACTION IN THE EVENT OF A STAFF CONFLICT OF INTEREST. THE CEO WILL DETERMINE HOW TO HANDLE THE DISCLOSED CONFLICT OF INTEREST, AND IN THE EVENT OF A VIOLATION WILL DETERMINE ANY APPROPRIATE DISCIPLINARY AND CORRECTIVE ACTION, UP TO AND INCLUDING TERMINATION. ALL ISTE POLICIES ARE REVIEWED ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CEO'S COMPENSATION IS DETERMINED BY THE ISTE BOARD OF DIRECTORS USING PERIODIC REVIEWS OF MARKET COMPENSATION DATA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15B:</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR KEY EMPLOYEES IS REVIEWED ANNUALLY AND DETERMINED BY THE CEO. DATA CONSIDERED MAY INCLUDE MARKET AND INDUSTRY COMPENSATION DATA, PEER COMPENSATION DATA, AS WELL AS YEARS AND LEVEL OF EXPERIENCE. INPUT MAY ALSO INCLUDE DATA FROM OUTSIDE CONSULTANTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>ISTES GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICIES, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST. THESE DOCUMENTS ARE SUBMITTED TO FEDERAL/STATE GOVERNMENT REGISTRATIONS AND GRANT APPLICATIONS WHEN REQUIRED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:CONTRACTS TOTAL FEES:3218943</ExplanationTxt>
      </SupplementalInformationDetail>
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  </ReturnData>
</Return>
