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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>55202</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Walter D Downing Jr</PersonNm>
        <TitleTxt>Executive Vice Pres.</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.10</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>673574</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>48892</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Beth Ann Rafferty</PersonNm>
        <TitleTxt>Chief Financial Officer</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>379582</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>46182</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Linda Boehme</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>209894</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>41038</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kenneth H Bennett Jr</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>241960</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>29348</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>James L Burch</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>557017</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>53834</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Danny M Deffenbaugh</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
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        <OtherCompensationAmt>40838</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Steven W Dellenback</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>307410</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>54552</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Paul Easley</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Michael MacNaughton</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>30967</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Anthony Magaro</PersonNm>
        <TitleTxt>Vice President (Eff. Dec. 2018)</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
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        <OtherCompensationAmt>41402</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Steven D Marty</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>358202</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>48246</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Massey</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>C Nils Smith</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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        <OtherCompensationAmt>53331</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Daniel W Stewart</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
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        <OtherCompensationAmt>53332</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Monica R Trollinger</PersonNm>
        <TitleTxt>General Counsel</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>46516</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Scott J Bolton</PersonNm>
        <TitleTxt>Associate Vice President</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <OtherCompensationAmt>55541</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Stephan A Fuselier</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
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        <OtherCompensationAmt>29986</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Robin Mihran</PersonNm>
        <TitleTxt>Assistant Vice President</TitleTxt>
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        <OtherCompensationAmt>57678</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Sol A Stern</PersonNm>
        <TitleTxt>Associate Vice President</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>59677</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>William M Thompson</PersonNm>
        <TitleTxt>President-Signature Science</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <OtherCompensationAmt>30735</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Wesley C Patrick</PersonNm>
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        <OtherCompensationAmt>46931</OtherCompensationAmt>
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          <BusinessName>
            <BusinessNameLine1Txt>Johns Hopkins University</BusinessNameLine1Txt>
          </BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>111000 John Hopkins</AddressLine1Txt>
            <CityNm>Laurel</CityNm>
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          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Arizona State University</BusinessNameLine1Txt>
          </BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 871704</AddressLine1Txt>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Johann Haltermann Ltd</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Chevron Phillips</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1301 McKinney St</AddressLine1Txt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Aerotek</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 630853</AddressLine1Txt>
            <CityNm>Baltimore</CityNm>
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          </USAddress>
        </ContractorAddress>
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        <BusinessCd>541700</BusinessCd>
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      <ProgramServiceRevenueGrp>
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      <RentalIncomeOrLossGrp>
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        <TotalRevenueColumnAmt>75620</TotalRevenueColumnAmt>
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        <ProgramServicesAmt>335530</ProgramServicesAmt>
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        <ProgramServicesAmt>35000</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>1425825</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>303291</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>713797</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>5906236</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>420779</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>4517</ManagementAndGeneralAmt>
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        <Desc>Project cost-non labor</Desc>
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        <ProgramServicesAmt>208885412</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Income Tax</Desc>
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        <ManagementAndGeneralAmt>1524882</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>Purchased Services</Desc>
        <TotalAmt>23181613</TotalAmt>
        <ProgramServicesAmt>20121769</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3059844</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>Equipment Rental</Desc>
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        <ProgramServicesAmt>2515296</ProgramServicesAmt>
        <ManagementAndGeneralAmt>132188</ManagementAndGeneralAmt>
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      <AllOtherExpensesGrp>
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        <ProgramServicesAmt>2357692</ProgramServicesAmt>
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        <ProgramServicesAmt>550633876</ProgramServicesAmt>
        <ManagementAndGeneralAmt>93823359</ManagementAndGeneralAmt>
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        <EOYAmt>228988121</EOYAmt>
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        <EOYAmt>150309271</EOYAmt>
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        <EOYAmt>11772999</EOYAmt>
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        <EOYAmt>4981287</EOYAmt>
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      <LandBldgEquipBasisNetGrp>
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        <EOYAmt>281336781</EOYAmt>
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      <OtherAssetsTotalGrp>
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        <EOYAmt>84415652</EOYAmt>
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      <TotalAssetsGrp>
        <BOYAmt>720619580</BOYAmt>
        <EOYAmt>761804112</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>104977599</EOYAmt>
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        <PersonNm>Beth Ann Rafferty</PersonNm>
        <TitleTxt>Chief Financial Officer</TitleTxt>
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        <PersonNm>Linda Boehme</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
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        <PersonNm>Kenneth H Bennett Jr</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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        <PersonNm>James L Burch</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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        <PersonNm>Danny M Deffenbaugh</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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        <PersonNm>Steven W Dellenback</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
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        <PersonNm>Paul Easley</PersonNm>
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        <PersonNm>Michael MacNaughton</PersonNm>
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        <PersonNm>Anthony Magaro</PersonNm>
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        <PersonNm>Steven D Marty</PersonNm>
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        <PersonNm>Mary Massey</PersonNm>
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        <PersonNm>Daniel W Stewart</PersonNm>
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        <PersonNm>Monica R Trollinger</PersonNm>
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        <PersonNm>Scott J Bolton</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Stephan A Fuselier</PersonNm>
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        <PersonNm>Sol A Stern</PersonNm>
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        <PersonNm>William M Thompson</PersonNm>
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        <PersonNm>Wesley C Patrick</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Institute's travel policy generally does not permit first class travel. There are a small number of exceptions for approved medical conditions or other business required special circumstances. Tax indemnification and gross-up payments: SwRI provided additional cash compensation (reported on the W-2 and Schedule J) to partially offset the economic impact of a grandfathered taxable benefit to one officer. This represents .36% of total officer compensation. Health or social club dues/fees: SwRI pays the membership cost for two officers at two social clubs. These memberships are used primarily for business meetings. Any personal charges are paid by the officers.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Also referencing Form 990, Part VII, Sec. A., Col. (D) and Schedule J, Part II, Col. (B)(iii) and (F) regarding J. Dan Bates. The Institute has a noncontributory defined benefit pension plan, which is a grandfathered 457 plan, that was granted to Institute officers who were employed as of April 30, 1981. Benefits are provided through a group annuity contract. The last active participant, J. Dan Bates, retired in September, 2014. He will receive a monthly benefit for his lifetime, with a twenty-year guarantee. The actual benefit paid in 2018 was $301,981. Additionally, he received distributions from the Institute's Sec. 457(b) Plan of $70,077 and Director's Fees of $34,000.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>The Institute has an Annual Incentive Compensation Plan for officers which is subject to oversight by the Compensation Committee of the Board of Directors. The Plan is based on the Institute's mission and uses both strategic and operational performance metrics as the basis for non-fixed payments, if any. All amounts paid under the Annual Incentive Compensation Plan are determined, reviewed and approved by the Board Compensation Committee. Amounts paid during calendar year 2018 are shown on Sch. J, Part II, Col. (B)(ii).</ExplanationTxt>
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        <ExplanationTxt>A summary of Form 990 was reviewed with the Audit Committee of the Board of Directors. Schedule J compensation data was reviewed with the Compensation Committee. A copy of the completed Form 990, including all schedules, was electronically provided to all board members prior to filing.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Directors of the organization are obligated under the conflict of interest policy to report all conflicts, to disclose all interests that could arise to conflicts, and all covered family and business relationships when completing the required annual disclosure questionnaire.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Determination of Compensation: SwRI's strategy is to provide compensation that is fair, reasonable, and consistent with compensation paid for similar work in relevant labor areas and with compensation paid by Institute competitors in the markets for scientific research and development (R&amp;D) and other technical services. The principal compensation authority is vested with the Board of Directors; however, the President of the Institute retains the authority to determine how various programs will be structured and administered subject to the oversight of the Compensation Committee of the Board of Directors. The Committee uses reputable compensation survey data, gathered annually, to compare the compensation of Officers to peer groups, within the relevant market segments, targeting an appropriate percentile corresponding to performance both for the year in question, and considering longer-term performance trends for total compensation. This review shall include comparative analysis of compensation paid by the Institute to compensation paid by local, sector, and national applied research and development organizations of similar size, both for profit and nonprofit organizations. The Committee engages the services of an external compensation advisor when conducting such comparability studies. Compensation Committee Review and Approval: The Board of Director delegates to the Committee the responsibility, in consultation with the President to review, approve and inform the Board of Directors of the changes in annual compensation and benefits for all Officers, except the President and Executive Vice President. The Committee will review the performance of the President and Executive Vice President and make a recommendation to the Board of Director for the total compensation for both of these officers. Adequate documentation is created contemporaneously and maintained to substantiate the basis for the Committee's and the Board of Directors' determination of total compensation for the President and all other Officers.</ExplanationTxt>
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        <ExplanationTxt>The organization's governing documents, conflict of interest policy and financial statements are available to the public upon written request to the organization's Treasurer.</ExplanationTxt>
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        <ExplanationTxt>INCREASED OBLIGATION FOR POST RETIREMENT BENEFIT (NET) -7,590,731.</ExplanationTxt>
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