Bài giảng Romney_ais13 - Chapter 22: Systems Design, Implementation, and Operation

Systems Design, Implementation, and OperationChapter 2222-1Learning ObjectivesDiscuss the conceptual systems design process and the activities in this phase.Discuss the physical systems design process and the activities in this phase.Discuss the systems implementation and conversion process and the activities in this phase.Discuss the systems operation and maintenance process and the activities in this phase.22-2Phase 2: Conceptual Systems Design22-3Phase 3: Physical Systems DesignOutput design (e.g., reports)File and database design Input design (e.g., forms, computer screen input)Program designProcedures designControl design22-4Program DesignDetermine user needsCreate and document development planWrite the computer codeTest the programDocument the programTrain usersInstall the system (including components and hardware)Use and modify the system22-5Phase 4: Systems ImplementationImplementation planSelect and train personnelComplete documentationDevelopment documentationOperations documentationUser documentationTesting the systemConversion22-6Testing the SystemWalk-throughsStep by step reviewProcessing test dataTest all valid transactions and error conditionsAcceptance testsUse copies of real data22-7Conversion ApproachesDirect conversionTerminates the old and begins with the new systemParallel conversionOperate old and new systems for a period of timePhase-in conversionGradual replacement of old elements with new system elementsPilot conversionImplement a system in a part of an organization (e.g., a branch)22-8Phase 5: Operations and MaintenanceConduct post-implementation review22-9Key TermsConceptual design specificationsConceptual systems design reportScheduled reportSpecial-purpose analysis reportTriggered exception reportDemand reportStructured programmingDebuggingProgram maintenancePhysical systems design reportSystems implementationImplementation planWalk-throughProcessing test dataAcceptance testConversionDirect conversionParallel conversionPhase-in conversionPilot conversionPost-implementation reviewPost-implementation review report22-10