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外文原文DatabaseDevelopmentProcessBasedoninformationengineeringinformationsystemsplanningdatabaseisasourceofdevelopmentprojects.Thesenewdatabasedevelopmentprojectsisusuallyinordertomeetthestrategicneedsoforganizations,suchasimprovingcustomersupport,improveproductandinventorymanagement,oramoreaccuratesalesforecast.However,manymoredatabasedevelopmentprojectisthebottom-upapproachemerging,suchasinformationsystemuserneedsspecificinformationtocompletetheirwork,thusbeginningaprojectrequest,andasotherinformationsystemsexpertsfoundthatorganizationsneedtoimprovedatamanagementandbeginnewprojects.Bottom-upeveninthecircumstances,tosetupanenterprisedatamodelisalsonecessarytounderstandtheexistingdatabasecanprovidethenecessarydata,otherwise,thenewdatabase,dataentitiesandattributescanbeaddedtothecurrentdataresourcestotheorganization.Boththestrategicneedsoroperationalinformationneedsofeachdatabasedevelopmentprojectsnormallyconcentratedinadatabase.Someprojectsonlyconcentratedinthedatabasedefinition,designandimplementationofadatabase,asafollow-uptothebasisofthedevelopmentofinformationsystems.However,inmostcases,thedatabaseandassociatedinformationprocessingfunctionasacompleteinformationsystemsdevelopmentprojectwaspartofthedevelopment.one.SystemDevelopmentLifeCycleGuidemanagementinformationsystemdevelopmentprojectsisthetraditionalprocessofsystemdevelopmentlifecycle(SDLC).SystemdevelopmentlifecycleisanorganizationofthedatabasedesignersandprogrammersinformationsystemcomposedofthePanelofExpertsdetaileddescription,development,maintenanceandreplacementoftheentireinformationsystemsteps.ThisprocessisbecauseWaterfallthanforeverystepintotheadjacentthenextstep,thatis,theinformationsystemisaspecificationdevelopedbyapieceofland,everypieceoftheoutputisunderaninput.Howevershowninthefigure,thesestepsarenotpurelylinear,eachofthestepsoverlapintime(andthuscanmanageparallelsteps),butwhentheneedtoreconsiderpreviousdecisions,butalsotorollbacksomestepsahead.(Andthereforewatercanbeputbackinthewaterfall!)Thesystemdevelopmentlifecycleincludingeachstageanddatabasedevelopment-relatedactivities,therefore,thequestionofdatabasemanagementsystemsthroughouttheentiredevelopmentprocess.InFigure5werepeatofthesystemdevelopmentlifecyclestageoftheseven,andoutlinesthecommondatabaseateachstageofdevelopmentactivities.Pleasenotethatthesystemsdevelopmentlifecyclestagesanddatabasedevelopmentstepsexistsbetweentherelationshipbetweentheconceptofmodelingdatainbothsystemsdevelopmentlifecyclestagesbetween.1.1EnterpriseModelingDatabasedevelopmentprocessfromtheenterprisemodeling(systemdevelopmentlifecyclestageoftheprojectfeasibilitystudies,andtochooseapart)Organizationssetthescopeandgeneraldatabasecontent.Enterprisemodelingininformationsystemsplanningandotheractivities,theseactivitiesdeterminewhichpartofinformationsystemsneedtochangeandstrengthentheentireorganizationandoutlinesthescopeofdata.Inthisstep,checkthecurrentdatabaseandinformationsystems,developmentoftheprojectasthemainareasofthenatureofthebusiness,withaverygeneraldescriptionofeachterminthedevelopmentofinformationsystemswhenneededdata.Eachitemonlywhenitachievedtheexpectedgoalsoforganizationscanbewhenthenextstep.1.2ConceptualDataModelingOnehasalreadybegunontheInformationSystemproject,theconceptofdatamodelingphaseoftheinformationsystemsneedsofallthedata.Itisdividedintotwostages.First,it...