软体品质管理.ppt

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1、軟體品質管理IntroductionWhatissoftwarequality?Howcanitbemeasured?Howcanitbemeasuredbeforethesoftwareisdelivered?SomekeyqualityfactorsSomemeasurableindicatorsofsoftwarequalityIntroductionThinkofaneverydayobjecte.g.achairHowwouldyoumeasureit’s“quality”?constructionq

2、uality?(e.g.strengthofthejoints,…)aestheticvalue?(e.g.elegance,…)fitforpurpose?(e.g.comfortable,…)AllqualitymeasuresarerelativethereisnoabsolutescalewecansayAisbetterthanBbutitisusuallyhardtosayhowmuchbetterForsoftware:constructionquality(建造的品質)?softwareisno

3、tmanufacturedaestheticvalue(美學上的價值)?butmostofthesoftwareisinvisibleaestheticvaluemattersfortheuserinterface,butisonlyamarginalconcernfitforpurpose?Needtounderstandthepurpose軟體品質因素MeasuringQualityTheQualityConcepts(abstractnotionsofqualityproperties)Measurabl

4、eQuantities(definesomemetrics)CountstakenfromDesignRepresentations(realizationofthemetrics)usabilityminutestakenforsomeusertask???timetakentolearnhowtouse?complexitycountprocedurecalls???informationflowbetweenmodules?reliabilityrunitandcountcrashesperhour???

5、meantimetofailure?examples...FourKeyQualityConceptsReliabilitydesignermustbeabletopredicthowthesystemwillbehave:completeness-doesitdoeverythingitissupposedtodo?(e.g.handleallpossibleinputs)consistency-doesitalwaysbehaveasexpected?(e.g.repeatability)robustnes

6、s-doesitbehavewellunderabnormalconditions?(e.g.resourcefailure)EfficiencyUseofresourcessuchasprocessortime,memory,networkbandwidthThisislessimportantthanreliabilityinmostcasesMaintainabilityHoweasywillitbetomodifyinthefuture?perfective,adaptive,correctiveUsa

7、bilityHoweasyisittouse?McCall’sQualityFactorsoperationrevisiontransitionCorrectnessreliabilityusabilityintegrityefficiencyMaintainabilityFlexibilityTestabilityPortabilityReusabilityInteroperabilityGeneralutilityportabilityAs-isutilityMaintainabilityreliabil

8、ityefficiencyusabilitytestabilityunderstandabilitymodifiabilitydevice-independenceself-containednessaccuracycompletenessrobustness/integrityconsistencyaccountabilitydeviceefficiencyaccessibility