Information System Analysis-Determine business requirements

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1、InformationSystemAnalysisOverviewofInformationSystemAnalysis¢Threepartstoanalysis:ßDeterminingsystemrequirementsßStructuringrequirements¢Processmodeling¢ConceptualdatamodelingßSelectingbestalternativedesignstrategy¢ReferencerdrdßEssentialsofSystemAnaly

2、sisandDesign(3/4edition).JosephS.Valacich,JoeyF.George,JeffreyA.Hoffer.InformationSystemAnalysis:DeterminingsystemrequirementsDeterminingSystemRequirements¢GatherinformationonwhatsystemshoulddofrommanysourcesßUsersßReportsßFormsßProceduresDeterminingSy

3、stemRequirements¢CharacteristicsforGatheringRequirementsßImpertinence¢QuestioneverythingßImpartiality¢FindthebestorganizationalsolutionßRelaxationofconstraints¢AssumeanythingispossibleandeliminatetheinfeasibleßAttentiontodetail¢Everyfactmustfitwithever

4、yotherfactßReframing¢ViewtheorganizationinnewwaysDeliverablesandOutcomes¢TypesofDeliverables:ßInformationcollectedfromusersßExistingdocumentsandfilesßComputer-basedinformationßUnderstandingoforganizationalcomponents¢Businessobjective¢Informationneeds¢R

5、ulesofdataprocessing¢KeyeventsDeliverablesforrequirementsDeterminationStructuringrequirements¢Structuringmeanstakingthesystemrequirementsyoufindduringrequirementsdeterminationandorderingthemintotables,diagrams,andotherformatsthatmakethemeasiertotransla

6、teintotechnicalsystemspecifications.TraditionalMethodsforDeterminingRequirements¢InterviewingandListeningßGatherfacts,opinions,andspeculationsßObservebodylanguageandemotionsßGuidelines¢PlantheinterviewßChecklistßAppointment¢Beneutral¢Listenandtakenotes

7、¢SeekadiverseviewTraditionalMethodsforDeterminingRequirements¢Interviewingandlistening(Cont’d)ßInterviewQuestions¢Open-EndedßNopre-specifiedanswersßUsedtoprobeforunanticipatedanswers¢Close-EndedßRespondentisaskedtochoosefromasetofspecifiedresponsesßWor

8、kwellwhenthepopularanswerstoquestionsareknownßDonotrequirealongperiodoftime,andcancoveragreaternumberoftopicsTraditionalMethodsforDeterminingRequirements¢DirectlyObservingUsersßServesasagoodmethodtosupplementinterviewsßOftendifficulttoo