软件工程第9版部分习题答案.doc

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1、习题参考答案Exercises(Homework):P251.3Whatarethefourimportantattributesthatallprofessionalsoftwareshouldhave?Suggestfourotherattributesthatmaysometimesbesignificant.Answer:Fourimportantattributesaremaintainability,dependability,performanceandusability.Otherattributesthatmaybesigni

2、ficantcouldbereusability(canitbereusedinotherapplications),distributability(canitbedistributedoveranetworkofprocessors),portability(canitoperateonmultipleplatformse.glaptopandmobileplatforms)andinter-operability(canitworkwithawiderangeofothersoftwaresystems).Decompositionsof

3、the4keyattributese.g.dependabilitydecomposestosecurity,safety,availability,etc.isalsoavalidanswertothisquestion.2.1Givingreasonsforyouranswerbasedonthetypeofsystembeingdeveloped,suggestthemostappropriategenericsoftwareprocessmodelthatmightbeusedasabasisformanagingthedevelopm

4、entofthefollowingsystems:•Asystemtocontrolanti-lockbrakinginacar•Avirtualrealitysystemtosupportsoftwaremaintenance•Auniversityaccountingsystemthatreplacesanexistingsystem•AninteractivetravelplanningsystemthathelpsusersplanjourneyswiththelowestenvironmentalimpactAnswer:1.Anti

5、-lockbrakingsystemThisisasafety-criticalsystemsorequiresalotofup-frontanalysisbeforeimplementation.Itcertainlyneedsaplan-drivenapproachtodevelopmentwiththerequirementscarefullyanalysed.Awaterfallmodelisthereforethemostappropriateapproachtouse,perhapswithformaltransformations

6、betweenthedifferentdevelopmentstages.2.VirtualrealitysystemThisisasystemwheretherequirementswillchangeandtherewillbeanextensiveuserinterfacecomponents.Incrementaldevelopmentwith,perhaps,someUIprototypingisthemostappropriatemodel.Anagileprocessmaybeused.3.Universityaccounting

7、systemThisisasystemwhoserequirementsarefairlyell-knownandwhichwillbeusedinanenvironmentinconjunctionwithlotsofotherstemssuchasaresearchgrantmanagementsystem.Therefore,areuse-basedproachislikelytobeappropriateforthis.4.InteractivetravelplanningsystemSystemwithacomplexuserinte

8、rfacebutwhichmustbestableandreliable.Anincrementaldevelopmentapproachisthem