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Module1:BestPracticesofSoftwareEngineering1SixBestPractices:DevelopIterativelyManageRequirementsUseComponentArchitecturesModelVisually(UML)ContinuouslyVerifyQualityManageChangeWaterfallDevelopmentCharacteristics：DelaysconfirmationofcriticalriskresolutionMeasuresprogressbyassessingworkproductsthatarepoorpredictorsoftime-to-completionDelaysandaggregatesintegrationandtestingPrecludesearlydeploymentFrequentlyresultsinmajorunplannediterations1.1DevelopIteratively：Theearliestiterationsaddressthegreatestrisks.Eachiterationincludesintegrationandtestingandproducesanexecutablerelease.Iterationshelp:Resolvemajorrisksbeforemakinglargeinvestments.Enableearlyuserfeedback.Maketestingandintegrationcontinuous.Focusprojectshort-termobjectivemilestones.Makepossibledeploymentofpartialimplementations.Iterativeprocessesweredevelopedinresponsetothesewaterfallcharacteristics.Withaniterativeprocess,thewaterfallstepsareappliediteratively.Insteadofdevelopingthewholesysteminlockstep,anincrement(forexample,asubsetofsystemfunctionality)isselectedanddeveloped,thenanotherincrement,andsoon.Theselectionofthefirstincrementtobedevelopedisbasedonrisk,withthehighestpriorityrisksfirst.Toaddresstheselectedrisk(s),chooseasubsetofusecases.Developtheminimalsetofusecasesthatwillallowobjectiveverification(thatis,throughasetofexecutabletests)oftherisksthatyouhavechosen.Thenselectthenextincrementtoaddressthenext-highestrisk,andsoon.Thusyouapplythewaterfallapproachwithineachiteration,andthesystemevolvesincrementally.1.2ManageRequirementsMakingsureyousolvetherightproblemandbuildtherightsystembytakingasystematicapproachtoeliciting、organizing、documenting、managingthechangingrequirementsofasoftwareapplication.1.3ResilientComponent-BasedArchitecturesArchitectureisapartofDesign.Itisaboutmakingdecisionsonhowthesystemwillbebuilt.Butitisnotallofthedesign.Itstopsatthemajorabstractions,or,inotherwords,theelementsthathavesomepervasiveandlong-lastingeffectonsystemperformanceandabilitytoevolve.Resili
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