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32 Pages

ch01(1)

Course: CIS339 NONE, Spring 2011
School: DeVry Chicago
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SystemsAnalysisandDesignWithUML2.0 AnObjectOrientedApproach,SecondEdition Chapter1:IntroductiontoSystemsAnalysisand Design AlanDennis,BarbaraWixom,andDavidTegarden 2005 JohnWiley&Sons,Inc. Slide1 Copyright2005 JohnWiley&Sons,Inc. Allrightsreserved.Reproductionortranslationofthiswork beyondthatpermittedinSection117ofthe1976UnitedStates CopyrightActwithouttheexpresswrittenpermissionofthe copyrightownerisunlawful. Requestforfurtherinformationshouldbeaddressedtothe PermissionsDepartment,JohnWiley&Sons,Inc. Thepurchasermaymakebackupcopiesforhis/herownuseonly andnotforredistributionorresale. ThePublisherassumesnoresponsibilityforerrors,omissions,or damages,causedbytheuseoftheseprogramsorfromtheuseof theinformationcontainedherein. Slide2 INTRODUCTION Chapter1 Slide3 KeyIdeas Manyfailedsystemswere abandonedbecauseanalyststriedto buildwonderfulsystemswithout understandingtheorganization. Theprimarilygoalistocreatevalue fortheorganization. Slide4 KeyIdeas Thesystemsanalystisakeyperson analyzingthebusiness,identifying opportunitiesforimprovement,and designinginformationsystemsto implementtheseideas. Itisimportanttounderstandanddevelop throughpracticetheskillsneededto successfullydesignandimplementnew informationsystems. Slide5 THESYSTEMS DEVELOPMENTLIFECYCLE Slide6 MajorAttributesofthe Lifecycle Theproject Movessystematicallythroughphaseswhere eachphasehasastandardsetofoutputs Producesprojectdeliverables Usesdeliverablesinimplementation Resultsinactualinformationsystem Usesgradualrefinement Slide7 ProjectPhases Planning Whybuildthesystem? Analysis Who,what,when,wherewillthesystembe? Design Howwillthesystemwork? Implementation Systemdelivery Slide8 ASimpleProcessforMakingLunch Slide9 Planning Identifyingbusinessvalue Analyzefeasibility Developworkplan Stafftheproject Controlanddirectproject Slide10 Analysis Analysis Informationgathering Processmodeling Datamodeling Slide11 Design Physicaldesign Architecturaldesign Interfacedesign Databaseandfiledesign Programdesign Slide12 Implementation Construction Installation Slide13 ProcessesandDeliverables Process Product Planning ProjectPlan Analysis SystemProposal Design Implementation Slide14 System Specification NewSystemand MaintenancePlan SYSTEMDEVELOPMENT Methodologies Slide15 WhatIsaMethodology? Aformalizedapproachorseriesof steps Writingcodewithoutawellthought outsystemrequestmayworkfor smallprograms,butrarelyworksfor largeones. Slide16 StructuredDesign Projectsmovemethodicallyfrom onetothenextstep Generally,astepisfinishedbefore thenextonebegins Slide17 WaterfallDevelopmentMethod Slide18 ProsandConsoftheWaterfall Method Pros Identifiessystems requirementslong beforeprogramming begins Cons Designmustbe specifiedonpaper beforeprogramming begins Longtimebetween systemproposaland deliveryofnew system Slide19 ParallelDevelopment Slide20 AlternativestotheSDLC RapidApplicationDevelopment (RAD) PhasedDevelopment Prototyping ThrowAwayPrototyping Slide21 RapidApplication Development Criticalelements CASEtools JADsessions Fourthgeneration/visualization programminglanguages Codegenerators Slide22 RapidApplication DevelopmentCategories Phaseddevelopment Aseriesofversions Prototyping Systemprototyping Throwawayprototyping Designprototyping AgileDevelopment ExtremeDevelopment Slide23 HowPrototypingWorks Slide24 ThrowawayPrototyping Slide25 SelectingtheAppropriate Methodology ClarityofUserRequirements FamiliaritywithTechnology SystemComplexity SystemReliability ShortTimeSchedules ScheduleVisibility Slide26 CriteriaforSelectinga Methodology Slide27 ProjectTeamRolesandSkills Slide28 InformationSystemsRoles Businessanalyst Systemanalyst Infrastructureanalyst Changemanagementanalyst Projectmanager Slide29 ProjectTeamRoles Slide30 SummaryPart1 TheSystemsDevelopmentLifecycleconsists offourstages:Planning,Analysis,Design, andImplementation Themajordevelopmentmethodologies: Structureddesign thewaterfallmethod Paralleldevelopment RADdevelopment Prototyping(regularandthrowaway) Agiledevelopment Slide31 XPstreamlineSDLC SummaryPart2 Therearefivemajorteamroles:business analyst,systemsanalyst,infrastructureanalyst, changemanagementanalystandproject manager. Slide32
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