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        <TitleTxt>IMMEDIATE PAST PRES (AS OF OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>6.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>1518</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAUL BOWEN</PersonNm>
        <TitleTxt>IMMEDIATE PAST PRES (THRU OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>6.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>374</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>RALPH E EXTON</PersonNm>
        <TitleTxt>TREASURER (THRU OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>6.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JAMIE EICHENBERGER</PersonNm>
        <TitleTxt>TREASURER (AS OF OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>6.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>LYNN BROADDUS</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>345</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOAN HAWLEY</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>193</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CLAUS HOMANN</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>866</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>KAREN KUBICK</PersonNm>
        <TitleTxt>TRUSTEE (THRU OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MARK POLING</PersonNm>
        <TitleTxt>TRUSTEE (AS OF OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PETER VANROLLEGHEM</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>IFETAYO VENNER</PersonNm>
        <TitleTxt>TRUSTEE (AS OF OCT '17)</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>EILEEN O'NEILL</PersonNm>
        <TitleTxt>SECRETARY &amp; EXECUTIVE DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>343902</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>62715</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PENNY YOUNG</PersonNm>
        <TitleTxt>DEPUTY EXECUTIVE DIRECTOR &amp; CFO</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>206211</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>41845</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAMELA HENRY</PersonNm>
        <TitleTxt>DEPUTY EXECUTIVE DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>206770</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>40435</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TIMOTHY WILLIAMS</PersonNm>
        <TitleTxt>DEPUTY EXECUTIVE DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>207199</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>27107</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>SACHA CAREY</PersonNm>
        <TitleTxt>SR. DIRECTOR, EXHIBITIONS</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>138333</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>38990</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>BARRY LINER</PersonNm>
        <TitleTxt>CHIEF TECHNICAL OFFICER</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>139094</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>38563</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CLAUDIO TERNIEDEN</PersonNm>
        <TitleTxt>SR. DIRECTOR, GOV AFFAIRS &amp; SP</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>134837</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>31320</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>LYNN THOMSON</PersonNm>
        <TitleTxt>SR. DIRECTOR, INFORMATION TECHNOLOGY</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>138321</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>20487</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MATTHEW RIES</PersonNm>
        <TitleTxt>CHIEF TECHNICAL OFF. (THRU NOV '17)</TitleTxt>
        <AverageHoursPerWeekRt>37.50</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>142225</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>31501</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>1660346</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>332963</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>23</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>FREEMAN</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1600 VICEROY DR SUITE 100</AddressLine1Txt>
            <CityNm>DALLAS</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>75235</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>AUDIO VISUAL &amp; DECORATING</ServicesDesc>
        <CompensationAmt>1078936</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>BRIGHTKEY INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>60 WEST STREET SUITE 300</AddressLine1Txt>
            <CityNm>ANNAPOLIS</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>21401</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>MEMBERSHIP</ServicesDesc>
        <CompensationAmt>499954</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>INITIATIVE SALES &amp; MKTG ENVIRONMENT LTD</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <ForeignAddress>
            <AddressLine1Txt>46 LEXINGTON 40 CITY ROAD</AddressLine1Txt>
            <CityNm>LONDON</CityNm>
            <CountryCd>UK</CountryCd>
            <ForeignPostalCd>EC1Y 2AN</ForeignPostalCd>
          </ForeignAddress>
        </ContractorAddress>
        <ServicesDesc>ADVERTISEMENT/EXHIBIT BOOTH SALES</ServicesDesc>
        <CompensationAmt>435614</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PRODUCTION TRANSPORT INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>21250 HAWTHORNE BLVD STE 535</AddressLine1Txt>
            <CityNm>TORRANCE</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>90503</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>TRANSPORTATION</ServicesDesc>
        <CompensationAmt>336879</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PERSONIFY</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO BOX 759470</AddressLine1Txt>
            <CityNm>BALTIMORE</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>21275</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>COMPUTER SERVICES</ServicesDesc>
        <CompensationAmt>301051</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>15</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>10912</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>1133721</AllOtherContributionsAmt>
      <TotalContributionsAmt>1144633</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>ANNUAL CONFERENCE</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>15573148</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>15027280</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>545868</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>4026989</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>4026989</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>TECHNICAL PROG &amp; SEM</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2436264</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2436264</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PUBLICATIONS &amp; SUBS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2126428</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>463325</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>1663103</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>WEBSITE ADVERTISING</Desc>
        <BusinessCd>541800</BusinessCd>
        <TotalRevenueColumnAmt>651315</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>555149</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>96166</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
        <TotalRevenueColumnAmt>631918</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>631918</RelatedOrExemptFuncIncomeAmt>
      </TotalOthProgramServiceRevGrp>
      <TotalProgramServiceRevenueAmt>25446062</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>636199</TotalRevenueColumnAmt>
        <ExclusionAmt>636199</ExclusionAmt>
      </InvestmentIncomeGrp>
      <RoyaltiesRevenueGrp>
        <TotalRevenueColumnAmt>63948</TotalRevenueColumnAmt>
        <ExclusionAmt>63948</ExclusionAmt>
      </RoyaltiesRevenueGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>1772972</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>1637518</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>135454</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>135454</TotalRevenueColumnAmt>
        <ExclusionAmt>135454</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <GrossSalesOfInventoryAmt>806706</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>186166</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>620540</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>620540</RelatedOrExemptFuncIncomeAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>MISCELLANEOUS REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>109238</TotalRevenueColumnAmt>
        <ExclusionAmt>109238</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>109238</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>28156074</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>23206316</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>2764120</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1041005</ExclusionAmt>
      </TotalRevenueGrp>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>154550</TotalAmt>
        <ProgramServicesAmt>154550</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>38000</TotalAmt>
        <ProgramServicesAmt>38000</ProgramServicesAmt>
      </GrantsToDomesticIndividualsGrp>
      <ForeignGrantsGrp>
        <TotalAmt>135240</TotalAmt>
        <ProgramServicesAmt>135240</ProgramServicesAmt>
      </ForeignGrantsGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>1153435</TotalAmt>
        <ProgramServicesAmt>374852</ProgramServicesAmt>
        <ManagementAndGeneralAmt>778583</ManagementAndGeneralAmt>
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      <OtherSalariesAndWagesGrp>
        <TotalAmt>7800040</TotalAmt>
        <ProgramServicesAmt>5923841</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1876199</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>678818</TotalAmt>
        <ProgramServicesAmt>523992</ProgramServicesAmt>
        <ManagementAndGeneralAmt>154826</ManagementAndGeneralAmt>
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      <OtherEmployeeBenefitsGrp>
        <TotalAmt>1199149</TotalAmt>
        <ProgramServicesAmt>892192</ProgramServicesAmt>
        <ManagementAndGeneralAmt>306957</ManagementAndGeneralAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>633432</TotalAmt>
        <ProgramServicesAmt>449584</ProgramServicesAmt>
        <ManagementAndGeneralAmt>183848</ManagementAndGeneralAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>89808</TotalAmt>
        <ProgramServicesAmt>42939</ProgramServicesAmt>
        <ManagementAndGeneralAmt>46869</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>38689</TotalAmt>
        <ManagementAndGeneralAmt>38689</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>18480</TotalAmt>
        <ProgramServicesAmt>18480</ProgramServicesAmt>
      </FeesForServicesLobbyingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>2220674</TotalAmt>
        <ProgramServicesAmt>1858662</ProgramServicesAmt>
        <ManagementAndGeneralAmt>362012</ManagementAndGeneralAmt>
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      <AdvertisingGrp>
        <TotalAmt>224996</TotalAmt>
        <ProgramServicesAmt>206811</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18185</ManagementAndGeneralAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>985581</TotalAmt>
        <ProgramServicesAmt>789319</ProgramServicesAmt>
        <ManagementAndGeneralAmt>196262</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>1318124</TotalAmt>
        <ProgramServicesAmt>707406</ProgramServicesAmt>
        <ManagementAndGeneralAmt>610718</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <RoyaltiesGrp>
        <TotalAmt>20078</TotalAmt>
        <ProgramServicesAmt>20078</ProgramServicesAmt>
      </RoyaltiesGrp>
      <OccupancyGrp>
        <TotalAmt>433358</TotalAmt>
        <ProgramServicesAmt>19190</ProgramServicesAmt>
        <ManagementAndGeneralAmt>414168</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>927682</TotalAmt>
        <ProgramServicesAmt>769953</ProgramServicesAmt>
        <ManagementAndGeneralAmt>157729</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>5341196</TotalAmt>
        <ProgramServicesAmt>5135131</ProgramServicesAmt>
        <ManagementAndGeneralAmt>206065</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <InterestGrp>
        <TotalAmt>2116</TotalAmt>
        <ManagementAndGeneralAmt>2116</ManagementAndGeneralAmt>
      </InterestGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>646046</TotalAmt>
        <ProgramServicesAmt>37982</ProgramServicesAmt>
        <ManagementAndGeneralAmt>608064</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>189271</TotalAmt>
        <ProgramServicesAmt>2736</ProgramServicesAmt>
        <ManagementAndGeneralAmt>186535</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>PUBLICATIONS</Desc>
        <TotalAmt>1621853</TotalAmt>
        <ProgramServicesAmt>1621853</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>TEMP HELP</Desc>
        <TotalAmt>128240</TotalAmt>
        <ProgramServicesAmt>33130</ProgramServicesAmt>
        <ManagementAndGeneralAmt>95110</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>UBI TAX</Desc>
        <TotalAmt>2594</TotalAmt>
        <ManagementAndGeneralAmt>2594</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>INDIRECT COST ALLOCATIO</Desc>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>4232571</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-4232571</ManagementAndGeneralAmt>
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        <EOYAmt>17085959</EOYAmt>
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        <EOYAmt>502951</EOYAmt>
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        <EOYAmt>19712374</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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      <ReconcilationRevenueExpnssAmt>1854550</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>371970</NetUnrlzdGainsLossesInvstAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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        <CurrentTaxYearMinus2YearsAmt>1063168</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>23488648</CurrentTaxYearAmt>
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      <Total509Grp>
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      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearAmt>708366</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>8268</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>109238</CurrentTaxYearAmt>
        <TotalAmt>234446</TotalAmt>
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      <TotalSupportCalendarYearGrp>
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        <CurrentTaxYearMinus3YearsAmt>20673907</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearMinus1YearAmt>22712313</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>25450885</CurrentTaxYearAmt>
        <TotalAmt>111267771</TotalAmt>
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      <InvestmentIncomeCYPct>0.01580</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.01340</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART III, LINE 12, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER INCOME - 2013 AMOUNT: $ 73,243. 2014 AMOUNT: $ 11,620. 2015 AMOUNT: $ 32,077. 2016 AMOUNT: $ 8,268. 2017 AMOUNT: $ 109,238.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001" />
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      <TotalGrassrootsLobbyingGrp>
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      </TotalGrassrootsLobbyingGrp>
      <TotalDirectLobbyingGrp>
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      </TotalDirectLobbyingGrp>
      <TotalLobbyingExpendGrp>
        <FilingOrganizationsTotalAmt>53844</FilingOrganizationsTotalAmt>
      </TotalLobbyingExpendGrp>
      <OtherExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>24026611</FilingOrganizationsTotalAmt>
      </OtherExemptPurposeExpendGrp>
      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>24080455</FilingOrganizationsTotalAmt>
      </TotalExemptPurposeExpendGrp>
      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>1000000</FilingOrganizationsTotalAmt>
      </LobbyingNontaxableAmountGrp>
      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>250000</FilingOrganizationsTotalAmt>
      </GrassrootsNontaxableGrp>
      <TotLbbyngGrassrootMnsNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyngGrassrootMnsNonTxGrp>
      <TotLbbyExpendMnsLbbyngNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyExpendMnsLbbyngNonTxGrp>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>1000000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>1000000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>1000000</CurrentYearMinus1Amt>
        <CurrentYearAmt>1000000</CurrentYearAmt>
        <TotalAmt>4000000</TotalAmt>
      </AvgLobbyingNontaxableAmountGrp>
      <LobbyingCeilingAmt>6000000</LobbyingCeilingAmt>
      <AvgTotalLobbyingExpendGrp>
        <CurrentYearMinus3Amt>68352</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>74431</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>60342</CurrentYearMinus1Amt>
        <CurrentYearAmt>53844</CurrentYearAmt>
        <TotalAmt>256969</TotalAmt>
      </AvgTotalLobbyingExpendGrp>
      <AvgGrassrootsNontaxableGrp>
        <CurrentYearMinus3Amt>250000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>250000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>250000</CurrentYearMinus1Amt>
        <CurrentYearAmt>250000</CurrentYearAmt>
        <TotalAmt>1000000</TotalAmt>
      </AvgGrassrootsNontaxableGrp>
      <GrassrootsCeilingAmt>1500000</GrassrootsCeilingAmt>
      <AvgGrassrootsLobbyingExpendGrp>
        <CurrentYearAmt>3463</CurrentYearAmt>
        <TotalAmt>3463</TotalAmt>
      </AvgGrassrootsLobbyingExpendGrp>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LandGrp>
        <OtherCostOrOtherBasisAmt>792248</OtherCostOrOtherBasisAmt>
        <BookValueAmt>792248</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>3640149</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>2944903</DepreciationAmt>
        <BookValueAmt>695246</BookValueAmt>
      </BuildingsGrp>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>4954060</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>3385033</DepreciationAmt>
        <BookValueAmt>1569027</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
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        <BookValueAmt>731290</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
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        <BookValueAmt>250145</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>4037956</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>CAPITAL LEASE OBLIGATIONS</Desc>
        <Amt>238518</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION</Desc>
        <Amt>264433</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>502951</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>28212084</TotalRevEtcAuditedFinclStmtAmt>
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      <RevenueNotReportedAmt>371970</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>27840114</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>315960</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>315960</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>28156074</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>25985564</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>-315960</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>-315960</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>26301524</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>26301524</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD -186,166. REVENUE NETTED IN EXPENSE IN AUDIT 502,126.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD 186,166. REVENUE NETTED IN EXPENSE IN AUDIT -502,126.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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        <EmployeeCnt>1</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>PROGRAM SERVICES</TypeOfActivitiesConductedTxt>
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        <SpecificServicesProvidedTxt>INTERNATIONAL PAVILION PROGRAM EXPENSE</SpecificServicesProvidedTxt>
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      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>NORTH AMERICA</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTMAKING</TypeOfActivitiesConductedTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTMAKING</TypeOfActivitiesConductedTxt>
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      <ContinuationSpentAmt>0</ContinuationSpentAmt>
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        <RegionTxt>NORTH AMERICA</RegionTxt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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        <MannerOfCashDisbursementTxt>CHECK</MannerOfCashDisbursementTxt>
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        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND) - ALBANIA, ANDORRA, AUSTRIA, BELGIUM</RegionTxt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
        <CashGrantAmt>17740</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>NORTH AMERICA</RegionTxt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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        <MannerOfCashDisbursementTxt>WIRE</MannerOfCashDisbursementTxt>
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      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>1</ForeignCorpOwnershipInd>
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      <BoycottCountriesInd>1</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>FOREIGN RECIPIENTS OF WEF'S GRANTS/AWARDS ARE ITS INTERNATIONAL MEMBER ASSOCIATIONS AND THEIR STUDENT CHAPTERS. WHEN DISBURSING A DONATION/AWARD, WEF PROVIDES A LETTER STATING THE NATURE OF FUNDING AND STIPULATIONS AS TO THE USE OF FUNDS WHICH ARE TO BE FOLLOWED BY THE AWARDEE. WEF ALSO RECEIVES AND REVIEWS A QUARTERLY ACTIVITY REPORT SENT BY CANADIAN WATER &amp; WASTEWATER ASSOCIATION, A RECIPIENT OF WEF'S ANNUAL CONTRIBUTION.</ExplanationTxt>
      </SupplementalInformationDetail>
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      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
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        <RecipientBusinessName>
          <BusinessNameLine1Txt>US WATER ALLIANCE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
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        </USAddress>
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      </RecipientTable>
      <RecipientTable>
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          <BusinessNameLine1Txt>THE WATER RESEARCH FOUNDATION (WRF)</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>6666 WEST QUINCY AVE</AddressLine1Txt>
          <CityNm>DENVER</CityNm>
          <StateAbbreviationCd>CO</StateAbbreviationCd>
          <ZIPCd>80235</ZIPCd>
        </USAddress>
        <RecipientEIN>136211384</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>76000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>NATIONAL ASSOCIATION OF CLEAN WATER AGENCIES</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1816 JEFFERSON PL NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <RecipientEIN>237088488</RecipientEIN>
        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>PRW&amp;EA</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 13702</AddressLine1Txt>
          <CityNm>SAN JUAN</CityNm>
          <StateAbbreviationCd>PR</StateAbbreviationCd>
          <ZIPCd>009083702</ZIPCd>
        </USAddress>
        <RecipientEIN>660567962</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>12000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>AMERICAN RED CROSS</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>431 18TH STREET NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20006</ZIPCd>
        </USAddress>
        <RecipientEIN>530196605</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6700</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <Total501c3OrgCnt>4</Total501c3OrgCnt>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>SCHOLARSHIPS</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>25000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>PRIZES</GrantTypeTxt>
        <RecipientCnt>5</RecipientCnt>
        <CashGrantAmt>13000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>WHEN DISBURSING A DONATION/AWARD, WEF PROVIDES A LETTER STATING THE NATURE OF FUNDING AND STIPULATIONS AS TO THE USE OF FUNDS WHICH ARE TO BE FOLLOWED BY THE AWARDEE. WEF STAYS IN CONTACT WITH THE AWARD RECIPIENT TO ENSURE THAT THE FUNDS ARE USED FOR THE INTENDED PURPOSES. ONCE A SCHOLARSHIP RECIPIENT HAS BEEN NAMED, WEF VERIFIES WITH THE SCHOOL THAT THE STUDENT IS ENROLLED FOR THE FALL SEMESTER, THEN AGAIN VERIFIES THE ENROLLMENT PRIOR TO SENDING THE CHECK TO THE SCHOOL. IF THE STUDENT FAILS TO ATTEND, THE REFUND OF TUITION (SCHOLARSHIP) PAID BY WEF IS REFUNDED TO WEF. A NEW RECIPIENT IS CHOSEN EACH YEAR, THUS THIS PROCESS HAS TO BE REPEATED EACH YEAR. THE SCHOLARSHIP IS ALWAYS PAID DIRECTLY TO THE SCHOOL.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
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        <PersonNm>EILEEN O'NEILL</PersonNm>
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        <TotalCompensationFilingOrgAmt>412872</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>PENNY YOUNG</PersonNm>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>PAMELA HENRY</PersonNm>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>TIMOTHY WILLIAMS</PersonNm>
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        <TotalCompensationFilingOrgAmt>237122</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SACHA CAREY</PersonNm>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BARRY LINER</PersonNm>
        <TitleTxt>CHIEF TECHNICAL OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>127837</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LYNN THOMSON</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MATTHEW RIES</PersonNm>
        <TitleTxt>CHIEF TECHNICAL OFF. (THRU NOV '17)</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING CALENDAR YEAR 2017, WEF ISSUED SPOUSAL TRAVEL EXPENSE REIMBURSEMENTS TO THE FOLLOWING BOARD MEMBERS: PAUL BOWEN, $374 LYNN BROADDUS, $345 CLAUS HOMANN, $866 JENNIFER HARTFELDER, $158 JOAN HAWLEY, $193 RICK WARER, $1,518 THESE REIMBURSEMENTS WERE TREATED AS TAXABLE COMPENSATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>WEF HAS INDIVIDUAL AND CORPORATE MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>WEF OFFICERS AND BOARD OF TRUSTEE NOMINEES SHALL BE RECOMMENDED BY THE WEF NOMINATING SUBCOMMITTEE, APPROVED BY THE BOARD, AND CONFIRMED BY THE HOUSE OF DELEGATES AS SO DESCRIBED IN THIS CONSTITUTION AND BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY PROPOSED CHANGES TO THE WEF ARTICLES OF INCORPORATION OR CONSTITUTION AND BYLAWS MUST BE RECOMMENDED BY THE BOARD OF TRUSTEES AND MUST ALSO BE RATIFIED BY A QUORUM OF VOTING MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS DRAFTED BY WEF'S OUTSIDE AUDIT FIRM WITH INFORMATION AND INPUT FROM WEF'S EXECUTIVE DIRECTOR AND DED/CHIEF FINANCIAL OFFICER. THE DRAFT 990 IS REVIEWED BY WEF'S TREASURER (AUDIT COMMITTEE CHAIR), EXECUTIVE DIRECTOR AND DED/CHIEF FINANCIAL OFFICER FOR ACCURACY. ONCE THIS TEAM HAS APPROVED THE DRAFT 990, IT IS FILED WITH THE IRS. THE FORM 990 IS THEN POSTED TO THE BOARD OF TRUSTEES' WEBSITE FOR ITS REVIEW AND REFERENCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH NEW BOARD TRUSTEE IS ORIENTED ON THE WEF CONFLICT OF INTEREST POLICY. EVERY TRUSTEE SIGNS A STATEMENT ANNUALLY ACKNOWLEDGING THE POLICY. AT THE BEGINNING OF EVERY BOARD MEETING, THE BOARD MEMBERS ARE REMINDED OF THEIR RESPONSIBILITY TO ACKNOWLEDGE CONFLICTS OF INTEREST WHEN THE AGENDA IS BEING REVIEWED. EACH MEMBER OF THE BOARD OF TRUSTEES IS REQUIRED TO DISCLOSE "OTHER INTERESTS," AS DEFINED IN THE POLICY, ANNUALLY AND MORE FREQUENTLY IF OTHER INTERESTS ARISE. THE BOARD OR DELEGATED REPRESENTATIVES OF THE BOARD MUST DECIDE WHAT, IF ANY, CORRECTIVE MEASURES TO TAKE IN RESPONSE TO DISCLOSURES OF OTHER INTERESTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>WEF PARTICIPATES IN SEVERAL SALARY SURVEYS IN THE WASHINGTON, DC AREA. SURVEYS AND DATA ARE RECEIVED AND REVIEWED TO INFORM A SALARY STRUCTURE AND TO MAKE COMPENSATION RECOMMENDATIONS. THE EXECUTIVE DIRECTOR'S COMPENSATION IS REVIEWED BY THE BOARD OF TRUSTEES. DATA FOR WEF KEY EMPLOYEES ARE REVIEWED BY THE EXECUTIVE DIRECTOR, HUMAN RESOURCES DIRECTOR AND LEADERSHIP STAFF.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>WEF'S FINANCIAL INFORMATION IS AVAILABLE ON THE 990 AND POSTED ON THE INTERNET THROUGH INFORMATION SOURCES SUCH AS GUIDESTAR. WEF'S POLICY ALSO MAKES COPIES OF WEF'S DOCUMENTS AVAILABLE TO DIRECT REQUESTS MADE TO WEF AT ITS OFFICE. WEF'S CONSTITUTION AND BYLAWS ARE PRINTED ANNUALLY AS PART OF A BOARD RESOURCE GUIDE. WEF VIEWS THESE AS PUBLIC DOCUMENTS AND WILL PROVIDE THEM TO ANY INTERESTED PARTY WHO SEEKS THEM. THERE HAVE BEEN VERY FEW, IF ANY, REQUESTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUDIT OVERSIGHT PROCESS HAS REMAINED UNCHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <AddressLine1Txt>6 BREWERY SQUARE ST JOHN STREET</AddressLine1Txt>
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          <ProvinceOrStateNm>LONDON</ProvinceOrStateNm>
          <CountryCd>UK</CountryCd>
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        <LegalDomicileForeignCountryCd>UK</LegalDomicileForeignCountryCd>
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