(Thermal Analysis)

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1、MeasuringandMaintainingCOTS-BasedSoftwareSystemsJeffreyVoasChiefScientist21515RidgetopCircle,Suite250Sterling,VA20166(703)404-9293jmvoas@rstcorp.comhttp://www.rstcorp.comIseebadthingsintheCOTS-softwareCopyright©1998RSTCorporation.AllRightsReservedOutlineCO

2、TS-WhatIsIt?Arecontractsorotherlegalmeansyourbestdefenseagainstdefectivethird-partysoftware?Aretheretechnicalapproachesthatyou,aCOTSconsumerorsystemintegrator,canuse?SummaryTerminologyCOTS(Commercial-off-the-shelf)OTS(Off-the-shelf),GOTSCAS(Commerciallyacq

3、uiredsoftware)NDI(Non-developmentalitem)Third-partyPublic-domainAcquiredDefinitionWhatisaCOTSsoftwarecomponent?Asoftwarecomponentthatisobtainedfromathirdpartyandthatthesystemintegratorusesonan“asis”basis.WhyCOTSSoftware?10linesofcodeperdayApplications>100,

4、000SLOCarecommonplaceTime-to-marketOnemonthslippagecanresultinhighpercentagelostmarketshareMandates(e.g.,DoD)EEdesignersbuildssystemsaroundavailablecomponentsfromcataloguesSoftwareEngineeringRealityCheckOurdefectdensitiesareaboutthesametodayastheywereatany

5、othertimeinthepast20years0.5-2.0softwarefailures/KSLOCOverthespectrumfromgamesoftwaretomainframesoftwaretosafety-criticalcodeTheamountofsoftwareinatypicaldevicedoublesevery18months[RemeBourguignon,VPofPhilipsinHolland(andnumerousAirbusofficials)]Q:Arewebet

6、terofftodaywithalloftherecent"advances"insoftwareengineeringtheoryandpracticethanwewerewithoutthem?The"COTS"Problems...1.Ifthenumbers(0.5-2.0softwarefailures/KSLOC)forCOTSofferingsarethesameorworse,thenwhat?2.IfyoursystemcontainsdefectiveCOTSsoftware,willy

7、ourclientsabsolveyouofblameforsystemfailures?3.WhatwillyoudoifyourelyonaCOTSvendorthatgoesoutofbusiness?4.Willweeversolvethecompositionproblemassociatedwithcomponent-basedsoftwareengineering?5.Softwaredevelopedelsewheremayhavedependability,security,andsafe

8、typroblems.6.Softwaredevelopedelsewhereisusuallydeliveredinablack-box.7.Maintenance/supportFrozenFunctionalitySystemswithlonglife-times8.Assumptionsconcerningtypicalusageduringtesting?9.AdequateTesting?DISTRU