OAD英文教材课后习题答案

Exercise1TechnologySystemsInc.needstodevelopsoftwareforabankthatwillofferanewservicetoitscustomers.TheserviceenablesthecustomersofthebanktopaytelephonebillsthroughtheInternet.Thebankisofferingthisserviceasanexperiment,andasaresult,therequirementsofthesoftwarearenotconsistent.Beinganexperimentalproject,therequirementsofthesoftwarecouldalsoevolveduringthesoftware-developmentprocess.Thenewrequirementsofthesoftwareincludesophisticateduserinteractionandeasy-to-useinterface.Anotherimportantrequirementforthesoftwareismaintainingsecurityandprivacyofcustomerinformationbecausethesoftwarewillinvolveauthorizingandauthenticatingcredit-cardinformationprovidedbythecustomer.Thebankisalsoplanningtoprovidethesameserviceonmobilephones.Othercompetitorsofthebankarealsoplanningtoofferthesameserviceand,therefore,thebankrequiresaworkingsystemforthissoftwareassoonaspossible.Onlyafewtop-levelmanagersofthebank,whohaveidentifiedthisnewservice,canprovidethefullrequirementsonthissoftware.However,theseemployeesarenotfrequentlyavailableduetotheirworkloadandpriorappointments.Identifytheapproachtobeusedfordevelopingthesoftwareforthebankandjustifyyourchoiceofapproach.SolutionTheprocessmodelidentifiedforthesoftwaresystemofTechnologySystemsiswin-winspiralmodel.Thereasonsforchoosingwin-winspiralmodelforthesoftwaresystemare:TechnologySystemInc.isnotverysureaboutthesuccessfulimplementationofalltherequirements.Asaresult,anexperimentalsoftwareisdevelopedanddeliveredinthefirstiteration.Ifthesoftwaresatisfiesthecustomerrequirements,theactivitiesforthenextiterationsareplanned.ThebankwantstodevelopsoftwareforInternetbankingaswellasmobilebanking.Therearerisksinvolvedintheproject,suchastechnicalrisks.Asaresult,TechnologySystemInc.needstodeveloponlyInternetbankingsoftwarefirstandafterthatMobilebankingshouldbeimplemented.Therefore,TechnologySystemSolutionstoExercisesChapter16.2InstructorInputsNIITInc.maynegotiaterequirementswiththebankandthesoftwarecanbedevelopedonthebasisoftheserequirements.TechnologySystemsInc.hasaconstraintontherequirementgatheringfortheentiresystem.Thebankmanagersarenotfrequentlyavailableduetotheirworkloadandpriorappointments.Asaresult,thesoftwaredevelopersneedtogathertheinitialrequirementsofthesystemandnotallofthesystemrequirements.Thenewrequirementscanbeimplementedinsubsequentiterationsofthedevelopmentprocess.Exercise1TechnologySystemsInc.decidedtocreateanewcomputertoprovidesimulationenvironmentfordevelopingreal-timesystems.TechnologySystemInc.wouldrequireadvancedhardwareandoperatingsystemtomanufacturethenewcomputer.Systemprograms,whichprovidetheinterfacebetweentheoperatingsystemandthehardware,alsoneedtobedeveloped.ThecompanyhasexperiencedJavaprogrammersand,therefore,itdecidestowritethesystemprogramsinJava.TheProjectManagerisawareofthelimitationsofJavainsystemprogramming.TheprogrammingteamidentifiessomeoftheadditionalfeaturesorextensionsthatneedtobeembeddedintheexistingJavacompilerforsystemprogramming.Itisalsoknownthatrequirementscanevolveduringthedevelopmentphaseoftheproject.OtherteammembersarealsodevelopingsoftwareforthenewcomputerandneedtheJavacompilertocompilethesoftware.MostofthesesoftwarerequirementsrequirefewextensionsintheJavalanguagetorunonanewOperatingSystem.Identifytheapproachtobeusedtocreatethecomputer.SolutionThedevelopmentapproachidentifiedforthesoftwaresystemofTechnologySystemsInc.isspiralapproach.Thereasonsforselectingthespiralapproachforthesoftwaresystemare:TechnologySystemsInc.mentionsthatthedevelopmentofthesoftwaredependsonthecompatibilitywiththeJavacomplier.Therefore,theexecutionofsoftwaredependsuponthereleaseofnewJavacomplierwithextension.Untilthecompilerisreleased,softwarewillnotexecute.TechnologySystemsInc.statedthattherequirementsmayevolveduringthedevelopmentofthesoftwaresystem.Asaresult,anotheriterationofSDLCChapter2NIITInstructorInputs6.3implementsthenewrequirementsthatareevolved.ThespiralmodelsupportstheiterationofSDLCforsoftwaresystems.Exercise1BlueValleyConsultingInc.isanorganizationofrealestatespecialistswhoprovideexpertadviceonpurchasing,leasing,selling,andbuildingproperties.Theorganizationwantstoautomaterecordingandreportingofinvestments,monitortheflowofplannedandinvestedcapitalfunds,trackthesourcesofcapitalfunds,andcalculatethereturnoninvestments.TheautomatedrealestatesystemofBlueValleyConsultingInc.shouldalsotracktheproperty,leaseholder,andcontractdetailsofinvestments.MikeWomack,CEOofBlueValleyConsultingInc.,hasdesignatedtheOperationsManagerforadministeringandmanagingthedataentryandmaintenanceworkfortheRealEstateManagementSystem.TheOperationsManager’sresponsibilitiesincludecreatingreportsforprovidinginformationaboutinquiriesonproposedinvestmentsandsaleandpurchasedetailsforproperties.TheorganizationhasaPropertyManagerwhoisresponsiblefortrackingtheutilizationoffundsmadeavailabletohimorherforsale,purchase,leasing,andanyotheractivitiesrelatedtoproperties.ThePropertyManagerwillalsoidentifydifferenttypesofprojectsforinvestments.BlueValleyConsultingInc.haspartnerswhohelptheorganizationtoensuresufficie