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      <GrantsToDomesticOrgs>
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        <ProgramServices>19549</ProgramServices>
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      <CompCurrentOfficersDirectors>
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        <ProgramServices>148416</ProgramServices>
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        <ManagementAndGeneral>28887</ManagementAndGeneral>
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        <ProgramServices>71073</ProgramServices>
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        <ManagementAndGeneral>235836</ManagementAndGeneral>
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        <ManagementAndGeneral>9098</ManagementAndGeneral>
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        <ManagementAndGeneral>18712</ManagementAndGeneral>
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        <ManagementAndGeneral>9863</ManagementAndGeneral>
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      <OtherExpenses>
        <Description>PARTICIPANT SUPPORT</Description>
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        <ProgramServices>53384</ProgramServices>
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      <OtherExpenses>
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      <AllOtherExpenses>
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      <ExpensesNotRptdOnFinStmt>0</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>6043365</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF INTENDED USE OF ENDOWMENT FUNDS:</Identifier>
        <ReturnReference>PART V, LINE 4:</ReturnReference>
        <Explanation>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.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>ASTC PERFORMED AN EVALUATION OF UNCERTAIN TAX POSITIONS FOR THE YEAR ENDED MARCH 31, 2012, 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.</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleF documentId="RetDoc1040500001">
      <GrantRecordsMaintained>1</GrantRecordsMaintained>
      <AcctsActvsOutUSTable>
        <Region>SUB-SAHARAN AFRICA</Region>
        <NumberOfOffices>0</NumberOfOffices>
        <NumberOfEmployees>0</NumberOfEmployees>
        <TypeOfActivitiesConducted>GRANTS TO RECIPIENTS LOCATED IN REGION.</TypeOfActivitiesConducted>
        <TotalExpenditures>6755</TotalExpenditures>
      </AcctsActvsOutUSTable>
      <AcctsActvsOutUSTable>
        <Region>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</Region>
        <NumberOfOffices>0</NumberOfOffices>
        <NumberOfEmployees>0</NumberOfEmployees>
        <TypeOfActivitiesConducted>GRANTS TO RECIPIENTS LOCATED IN REGION.</TypeOfActivitiesConducted>
        <TotalExpenditures>6300</TotalExpenditures>
      </AcctsActvsOutUSTable>
      <AcctsActvsOutUSTable>
        <Region>EAST ASIA AND THE PACIFIC</Region>
        <NumberOfOffices>0</NumberOfOffices>
        <NumberOfEmployees>0</NumberOfEmployees>
        <TypeOfActivitiesConducted>GRANTS TO RECIPIENTS LOCATED IN REGION.</TypeOfActivitiesConducted>
        <TotalExpenditures>6494</TotalExpenditures>
      </AcctsActvsOutUSTable>
      <SubtotalNumberOfOffices>0</SubtotalNumberOfOffices>
      <SubtotalNumberOfEmployees>0</SubtotalNumberOfEmployees>
      <ContNumberOfOffices>0</ContNumberOfOffices>
      <ContNumberOfEmployees>0</ContNumberOfEmployees>
      <TotalNumberOfOffices>0</TotalNumberOfOffices>
      <TotalNumberOfEmployees>0</TotalNumberOfEmployees>
      <SubtotalAmountSpent>19549</SubtotalAmountSpent>
      <ContAmountSpent>0</ContAmountSpent>
      <TotalAmountSpent>19549</TotalAmountSpent>
      <GrantsToOrgsOutsideUS>
        <Region>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</Region>
        <PurposeOfGrant>TO SUPPORT SCENARIOS PROJECT ON SUSTAINABILITY.</PurposeOfGrant>
        <AmountOfCashGrant>6300</AmountOfCashGrant>
        <MannerOfCashDisbursement>WIRE</MannerOfCashDisbursement>
      </GrantsToOrgsOutsideUS>
      <GrantsToOrgsOutsideUS>
        <Region>EAST ASIA AND THE PACIFIC</Region>
        <PurposeOfGrant>TO SUPPORT SCENARIOS PROJECT ON SUSTAINABILITY.</PurposeOfGrant>
        <AmountOfCashGrant>6494</AmountOfCashGrant>
        <MannerOfCashDisbursement>WIRE</MannerOfCashDisbursement>
      </GrantsToOrgsOutsideUS>
      <GrantsToOrgsOutsideUS>
        <Region>SUB-SAHARAN AFRICA</Region>
        <PurposeOfGrant>TO SUPPORT SCENARIOS PROJECT ON SUSTAINABILITY.</PurposeOfGrant>
        <AmountOfCashGrant>6755</AmountOfCashGrant>
        <MannerOfCashDisbursement>WIRE</MannerOfCashDisbursement>
      </GrantsToOrgsOutsideUS>
      <TotalNumberOf501c3Orgs>3</TotalNumberOf501c3Orgs>
      <TotalNumberOfOtherOrgs>0</TotalNumberOfOtherOrgs>
      <TransferToForeignCorp>0</TransferToForeignCorp>
      <InterestInForeignTrust>0</InterestInForeignTrust>
      <OwnForeignCorp>0</OwnForeignCorp>
      <PassiveForeignInvestCo>0</PassiveForeignInvestCo>
      <ForeignPartnership>0</ForeignPartnership>
      <BoycottCountries>0</BoycottCountries>
      <Form990ScheduleFPartV>
        <Identifier>PROCEDURE FOR MONITORING GRANTS OUTSIDE THE U.S.:</Identifier>
        <Explanation>SCHEDULE F, PART I, LINE 2: THERE IS A FORMAL CONTRACT WITH SOW SIGNED BETWEEN ASTC AND THE FOREIGN ENTITY. PERIODIC TELEPHONE CONFERENCES ARE HELD BETWEEN ASTC AND THE FOREIGN PARTICIPANTS WHERE THEY DESCRIBE THEIR ACTIVITIES RELATED TO THE GRANT. THE ENTITY MUST PRESENT BOTH AN INVOICE AND PROGRAMMATIC REPORT DESCRIBING THEIR ACTIVITIES PRIOR TO RECEIVING PAYMENT. IN ADDITION THERE IS A DELIVERABLE WHICH HAS BEEN AGREED UPON AND WHICH MUST BE COMPLETED BEFORE A SPECIFIC DEADLINE.</Explanation>
      </Form990ScheduleFPartV>
    </IRS990ScheduleF>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <RecordsMaintained>1</RecordsMaintained>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>CHABOT SPACE &amp; SCIENCE CENTER</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>10000 SKYLINE BLVD</AddressLine1>
          <City>OAKLAND</City>
          <State>CA</State>
          <ZIPCode>94619</ZIPCode>
        </AddressUS>
        <EINOfRecipient>943146233</EINOfRecipient>
        <IRCSection>501(C)(3)</IRCSection>
        <AmountOfCashGrant>19485</AmountOfCashGrant>
        <PurposeOfGrant>SUPPORT FOR SCANARIOS GRANT ON SUSTAINABILITY.</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MIAMI SCIENCE CENTER</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>3280 S MIAMI AVE</AddressLine1>
          <City>MIAMI</City>
          <State>FL</State>
          <ZIPCode>33129</ZIPCode>
        </AddressUS>
        <EINOfRecipient>073877037</EINOfRecipient>
        <IRCSection>501(C)(3)</IRCSection>
        <AmountOfCashGrant>19485</AmountOfCashGrant>
        <PurposeOfGrant>SUPPORT FOR SCANARIOS GRANT ON SUSTAINABILITY.</PurposeOfGrant>
      </RecipientTable>
      <TotalNbrOf501C3AndGovtGrants>2</TotalNbrOf501C3AndGovtGrants>
      <TotalNbrOfOtherOrganizations>0</TotalNbrOfOtherOrganizations>
      <Form990ScheduleIPartIV>
        <Identifier>PROCEDURE FOR MONITORING GRANTS IN THE U.S.:</Identifier>
        <ReturnReference>PART I, LINE 2:</ReturnReference>
        <Explanation>SCHEDULE I, PART I, LINE 2: THERE IS A FORMAL CONTRACT INCLUDING A SOW SIGNED BETWEEN ASTC AND THE ENTITY. PERIODIC TELEPHONE CONFERENCES ARE HELD BETWEEN ASTC AND THE FOREIGN PARTICIPANTS WHERE THEY DESCRIBE THEIR ACTIVITIES RELATED TO THE GRANT. THE ENTITY MUST PRESENT BOTH AN INVOICE AND PROGRAMMATIC REPORT DESCRIBING THEIR ACTIVITIES PRIOR TO RECEIVING PAYMENT. IN ADDITION THERE IS A DELIVERABLE WHICH HAS BEEN AGREED UPON AND WHICH MUST BE COMPLETED BEFORE A SPECIFIC DEADLINE.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommittee>X</CompensationCommittee>
      <CompensationSurvey>X</CompensationSurvey>
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
      <SeverancePayment>0</SeverancePayment>
      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <CompBasedOnRevenueOfFilingOrg>0</CompBasedOnRevenueOfFilingOrg>
      <CompBasedOnRevenueRelatedOrgs>0</CompBasedOnRevenueRelatedOrgs>
      <CompBasedNetEarningsFilingOrg>0</CompBasedNetEarningsFilingOrg>
      <CompBasedNetEarningsRelateOrgs>0</CompBasedNetEarningsRelateOrgs>
      <AnyNonFixedPayments>0</AnyNonFixedPayments>
      <InitialContractException>0</InitialContractException>
      <Form990ScheduleJPartII>
        <NamePerson>ANTHONY ROCK</NamePerson>
        <BaseCompensationFilingOrg>219174</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>18818</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>22000</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>898</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>260890</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 6</ReturnReference>
        <Explanation>ASTC IS A PROFESSIONAL MEMBERSHIP ASSOCIATION WITH MORE THAN 540 MEMBERS IN 40 COUNTRIES. IT'S MEMBERSHIP CONSISTS OF SCIENCE-TECHNOLOGY CENTERS AND MUSEUMS, COMPANIES THAT OFFER PRODUCTS AND SERVICES TO SCIENCE MUSEUMS, AND OTHER ORGANIZATIONS THAT HAVE AN INTEREST IN INFORMAL SCIENCE EDUCATION.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 7A</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>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 COMMITTEES THEN CONDUCT 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>THE CONFLICT OF INTEREST POLICY IS AVAILABLE TO EACH BOARD MEMBER IN THE BOARD GUIDEBOOK THAT EACH BOARD MEMBER RECEIVES ROUTINELY. THE CONFLICT OF INTEREST POLICY IS PRESENTED ANNUALLY AT A BOARD MEETING.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>CHIEF EXECUTIVE OFFICER: THE PERSONNEL COMMITTEE OF THE BOARD OF DIRECTORS CONDUCTS AN ANNUAL REVIEW OF THE CHIEF EXECUTIVE OFFICER'S ATTAINMENT OF MUTUALLY AGREED UPON PERFORMANCE OBJECTIVES. THE PERSONNEL COMMITTEE DETERMINES WHETHER AND TO WHAT EXTENT THE CHIEF EXECUTIVE OFFICER 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 PRESIDENT DOCUMENTS IN WRITING THE RESULTS OF THE PERFORMANCE REVIEW AND THE BASIS FOR ANY DECISION TO INCREASE COMPENSATION. 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 CHIEF EXECUTIVE OFFICER. 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>ASTC'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE NOT MADE AVAILABLE TO THE PUBLIC.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>CHANGES IN NET ASSETS OR FUND BALANCES:</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 5:</ReturnReference>
        <Explanation>NET UNREALIZED GAINS ON INVESTMENTS: 170,542. PRIOR PERIOD ADJUSTMENTS: 252,014. TOTAL TO FORM 990, PART XI, LINE 5: 422,556.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>