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        <PersonNm>JENNIFER MARTIN</PersonNm>
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        <PersonNm>ANN METZGER</PersonNm>
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        <PersonNm>VAN REINER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TIM RITCHIE</PersonNm>
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        <PersonNm>JEFFREY RUDOLPH</PersonNm>
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        <PersonNm>SILVIA SINGER</PersonNm>
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        <PersonNm>ROSALIA VARGAS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BERT VESCOLANI</PersonNm>
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        <PersonNm>LARRY DUBINSKI</PersonNm>
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        <PersonNm>MATT FLEURY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANTHONY ROCK</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRENT PARKER</PersonNm>
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        <PersonNm>WALTER STAVELOZ</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES BELL</PersonNm>
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          <BusinessName>
            <BusinessNameLine1Txt>ARAMARK</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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        <ExclusionAmt>700</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>OTHER INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>450111</ExclusionAmt>
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        <ManagementAndGeneralAmt>462362</ManagementAndGeneralAmt>
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      <AllOtherExpensesGrp>
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        <ProgramServicesAmt>4417680</ProgramServicesAmt>
        <ManagementAndGeneralAmt>471219</ManagementAndGeneralAmt>
        <FundraisingAmt>36024</FundraisingAmt>
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        <EOYAmt>162131</EOYAmt>
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        <EOYAmt>287544</EOYAmt>
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        <EOYAmt>208648</EOYAmt>
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        <EOYAmt>353104</EOYAmt>
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        <EOYAmt>3628600</EOYAmt>
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        <EOYAmt>1000</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>4892199</EOYAmt>
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        <EOYAmt>269264</EOYAmt>
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        <EOYAmt>772433</EOYAmt>
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        <EOYAmt>637534</EOYAmt>
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        <EOYAmt>1679231</EOYAmt>
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        <EOYAmt>2949884</EOYAmt>
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        <EOYAmt>48329</EOYAmt>
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        <CurrentTaxYearMinus2YearsAmt>2699042</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>64093</TotalAmt>
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        <FormAndLineReferenceDesc>SCHEDULE A, PART III, LINE 12, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>MISCELLANEOUS INCOME - 2012 AMOUNT: $ 20,983. 2013 AMOUNT: $ 804. 2014 AMOUNT: $ 1,510. 2015 AMOUNT: $ 1,130. 2016 AMOUNT: $ 908.</ExplanationTxt>
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          <AddressLine2>RESTRICTED</AddressLine2>
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        <FilingOrganizationsTotalAmt>11409</FilingOrganizationsTotalAmt>
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      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>392989</FilingOrganizationsTotalAmt>
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      <GrassrootsNontaxableGrp>
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        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
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        <CurrentYearMinus1Amt>15803</CurrentYearMinus1Amt>
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        <InvestmentEarningsOrLossesAmt>40596</InvestmentEarningsOrLossesAmt>
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        <InvestmentEarningsOrLossesAmt>-1351</InvestmentEarningsOrLossesAmt>
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        <ContributionsAmt>25</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>25296</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>389966</EndYearBalanceAmt>
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        <EndYearBalanceAmt>364645</EndYearBalanceAmt>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4924923</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
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        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTC'S ENDOWMENTS CONSIST OF A BOARD-RESTRICTED QUASI-ENDOWMENT FUND AND A DONOR-RESTRICTED ENDOWMENT FUND. THE PURPOSE OF THE BOARD-RESTRICTED QUASI-ENDOWMENT FUND IS TO SUPPORT ASTC'S GENERAL OPERATIONS, PROGRAMS AND SERVICES. THE PURPOSES OF THE DONOR-RESTRICTED ENDOWMENT FUNDS ARE TO INCREASE INTERNATIONAL MEMBERS' PARTICIPATION IN ASTC ACTIVITIES AND TO ADVANCE EXTRAORDINARY LEADERSHIP IN THE SCIENCE CENTER AND MUSEUM FIELD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTC PERFORMED AN EVALUATION OF UNCERTAIN TAX POSITIONS FOR THE YEAR ENDED MARCH 31, 2017, AND DETERMINED THAT THERE WERE NO MATTERS THAT WOULD REQUIRE RECOGNITION IN THE FINANCIAL STATEMENTS OR THAT MAY HAVE ANY EFFECT ON ITS TAX-EXEMPT STATUS.</ExplanationTxt>
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        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
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        <RegionTotalExpendituresAmt>5000</RegionTotalExpendituresAmt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>EAST ASIA AND THE PACIFIC</RegionTxt>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTS TO RECIPIENTS LOCATED IN REGION</TypeOfActivitiesConductedTxt>
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      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
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        <RegionTxt>SOUTH AMERICA</RegionTxt>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTS TO RECIPIENTS LOCATED IN REGION</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>15000</RegionTotalExpendituresAmt>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTS TO RECIPIENTS LOCATED IN REGION</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>15000</RegionTotalExpendituresAmt>
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        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <PurposeOfGrantTxt>TO EXECUTE WORLD BIOGEN TOUR</PurposeOfGrantTxt>
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        <MannerOfCashDisbursementTxt>WIRE TRANSFER</MannerOfCashDisbursementTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>SUB-SAHARAN AFRICA</RegionTxt>
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        <MannerOfCashDisbursementTxt>WIRE TRANSFER</MannerOfCashDisbursementTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
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        <MannerOfCashDisbursementTxt>WIRE TRANSFER</MannerOfCashDisbursementTxt>
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        <MannerOfCashDisbursementTxt>WIRE TRANSFER</MannerOfCashDisbursementTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>EAST ASIA AND THE PACIFIC</RegionTxt>
        <PurposeOfGrantTxt>TO EXECUTE WORLD BIOGEN TOUR</PurposeOfGrantTxt>
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        <MannerOfCashDisbursementTxt>WIRE TRANSFER</MannerOfCashDisbursementTxt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3:</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ANTHONY ROCK</PersonNm>
        <TitleTxt>PRESIDENT AND CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>284773</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>22660</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>24000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>898</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>332331</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>FOR THE YEAR ENDED DECEMBER 31, 2016, ASTC AWARDED A NON-FIXED BONUS PAYMENT TO ANTHONY ROCK, THE PRESIDENT AND CEO, IN THE AMOUNT OF $22,660. THE PAYMENT WAS DETERMINED BASED ON AN APPRAISAL OF HIS PERFORMANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTC IS A PROFESSIONAL MEMBERSHIP ASSOCIATION WITH MORE THAN 540 MEMBERS IN 40 COUNTRIES. ASTC HAS THREE CLASSES OF MEMBERS WHICH ARE: SCIENCE CENTER AND MUSEUM MEMBERS, SUSTAINING MEMBERS, AND GOVERNING MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH MEMBER RESPRESNTATIVE OF A GOVERNING MEMBER IS ENTITLED TO PARTICIPATE IN MEETINGS AND CAST ONE VOTE ON BEHALF OF ITS GOVERNING MEMBERS ON CORPORATION MATTERS BROUGHT TO THE MEMBERSHIP FOR A VOTE. ASTC'S BOARD OF DIRECTORS ARE ELECTED BY MAIL-IN BALLOT IN ADVANCE OF THE REGULAR ANNUAL MEETING BY A MAJORITY VOTE OF THE GOVERNING MEMBER REPRESENTATIVES. NOMINEES FOR THE POSITION OF DIRECTOR ARE SELECTED FROM THE GOVERNING MEMBER REPRESENTATIVES BY THE NOMINATING COMMITTEE OR BY WRITTEN DESIGNATION OF ANY FIVE GOVERNING MEMBER REPRESENTATIVES. MEMBER REPRESENTATIVES OF SCIENCE CENTER AND MUSEUM MEMBERS AND SUSTAINING MEMBERS ARE NOT ENTITLED TO VOTE ON CORPORATION MATTERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF THE FEDERAL FORM 990, PREPARED BY THE AUDIT FIRM, IS SUBMITTED TO THE ASTC STAFF, WHO FORWARDS IT VIA E-MAIL TO THE FINANCE &amp; AUDIT COMMITTEE MEMBERS FOR REVIEW. THE COMMITTEE THEN CONDUCTS A CONFERENCE CALL TO DISCUSS THE FEDERAL FORM 990 AND ITS VARIOUS SECTIONS. STAFF PREPARES A FORM DOCUMENT WITH SPECIFICS OF THE COMMITTEE'S REVIEW, INCLUDING AGREEMENT WITH THE INFORMATION PRESENTED, AND FORWARDS IT TO COMMITTEE MEMBERS FOR THEIR ELECTRONIC SIGNATURE. THE DRAFT FEDERAL FORM 990 ACCOMPANIED BY REVIEW COMMENTS IS THEN E-MAILED TO BOARD MEMBERS FOR THEIR REVIEW AND APPROVAL. ONCE ALL COMMENTS HAVE BEEN RECEIVED AND REVIEWED AND ANY NECESSARY CHANGES HAVE BEEN MADE BY THE AUDIT FIRM, ASTC APPROVES THE FINAL VERSION OF THE FEDERAL FORM 990 TO BE E-FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL ACTUAL AND POTENTIAL CONFLICTS OF INTEREST SHALL BE DISCLOSED BY BOARD MEMBERS TO THE ASTC EXECUTIVE COMMITTEE THROUGH THE ANNUAL DISCLOSURE FORM AND/OR WHENEVER AN ACTUAL OR POTENTIAL CONFLICT ARISES AS DISCOVERED THROUGH THE MONITORING OF CONTRACTS. THE DISINTERESTED MEMBERS OF THE EXECUTIVE COMMITTEE SHALL MAKE A DETERMINATION AS TO WHETHER A CONFLICT EXISTS AND WHAT SUBSEQUENT ACTION IS APPROPRIATE (IF ANY). THE EXECUTIVE COMMITTEE SHALL INFORM THE BOARD OF SUCH DETERMINATION AND ACTION. THE BOARD OF DIRECTORS SHALL RETAIN THE RIGHT TO MODIFY OR REVERSE SUCH DETERMINATION AND ACTION, AND SHALL RETAIN THE ULTIMATE ENFORCEMENT AUTHORITY WITH RESPECT TO THE INTERPRETATION AND APPLICATION OF THIS POLICY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PRESIDENT AND CEO: THE PERSONNEL COMMITTEE OF THE BOARD OF DIRECTORS CONDUCTS AN ANNUAL REVIEW OF THE PRESIDENT AND CEO'S ATTAINMENT OF MUTUALLY AGREED UPON PERFORMANCE OBJECTIVES. THE PERSONNEL COMMITTEE DETERMINES WHETHER AND TO WHAT EXTENT THE PRESIDENT AND CEO HAS ACHIEVED THE PERFORMANCE OBJECTIVES SUBJECT TO REVIEW AND APPROVAL OF THE EXECUTIVE COMMITTEE. THE EXECUTIVE COMMITTEE DETERMINES ANY SALARY INCREASE BASED ON THE RESULTS OF THE PERFORMANCE EVALUATION. THE DIRECTOR OF ADMINISTRATION AND HUMAN RESOURCES PROVIDES THE EXECUTIVE COMMITTEE WITH COMPARABLE COMPENSATION INFORMATION. THE CHAIR DOCUMENTS IN WRITING THE RESULTS OF THE PERFORMANCE REVIEW AND THE BASIS FOR ANY DECISION TO INCREASE COMPENSATION. THE LAST COMPENSATION REVIEW WAS PERFORMED IN NOVEMBER 2015. ALL OTHER EMPLOYEES: ALL EMPLOYEES RECEIVE A PERFORMANCE APPRAISAL BY THEIR SUPERVISOR ANNUALLY. THE REVIEW PROCESS INCLUDES SETTING PERFORMANCE OBJECTIVES FOR THE COMING YEAR AND ASSESSING ATTAINMENT OF PREVIOUS OBJECTIVES. A WRITTEN RECORD OF THE REVIEW IS SIGNED BY THE EMPLOYEE, THE SUPERVISOR, AND THE PRESIDENT AND CEO. ONE COPY IS GIVEN TO THE EMPLOYEE AND ONE IS KEPT IN ASTC'S PERSONNEL FILES. THE EMPLOYEE'S PERFORMANCE IS ONE BASIS FOR A MERIT INCREASE. AT LEAST BIANNUALLY, THE DIRECTOR OF ADMINISTRATION AND HUMAN RESOURCES REVIEWS COMPENSATION LEVELS FOR COMPARABLE POSITIONS AND MAKES ANY NEEDED ADJUSTMENTS IN SALARY RANGES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTC'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE NOT MADE AVAILABLE TO THE PUBLIC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>HONORARIA: PROGRAM SERVICE EXPENSES 68,526. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 68,526. SUBCONTRACTS - CAISE GRANT: PROGRAM SERVICE EXPENSES 118,852. MANAGEMENT AND GENERAL EXPENSES 11,426. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 130,278. CONSULTANTS - DIMENSIONS PROGRAM: PROGRAM SERVICE EXPENSES 32,424. MANAGEMENT AND GENERAL EXPENSES 3,117. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 35,541. CONSULTANTS - RESEARCH: PROGRAM SERVICE EXPENSES 10,555. MANAGEMENT AND GENERAL EXPENSES 1,015. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 11,570. CONSULTANTS - CONFERENCE: PROGRAM SERVICE EXPENSES 68,428. MANAGEMENT AND GENERAL EXPENSES 6,578. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 75,006. OTHER CONSULTANTS: PROGRAM SERVICE EXPENSES 86,277. MANAGEMENT AND GENERAL EXPENSES 8,294. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 94,571. CONSULTANTS - GOVERNMENT GRANT: PROGRAM SERVICE EXPENSES 174,664. MANAGEMENT AND GENERAL EXPENSES 16,792. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 191,456.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>