开发信息系统外文翻译.docx
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开发信息系统外文翻译.docx
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开发信息系统外文翻译
毕业论文(设计)
外文翻译
DevelopingInformationSystems
Inthisandthefollowingchapters,wewilldiscussdifferentapproachesconcerninghowanorganizationcanobtainitsinformationsystemsoncethedecisioninfavorofasystemhasbeenmade.
Whilechapter7willdealwithbuyingandintroducingsoftwarethatwasdevelopedbyothers,inparticularstandardsoftware,thefocusinthischapterisonhowtobuildcompletelynewinformationsystemsornewmodulesthatextendexistinginformationsystemswithinanorganization.By"newmodules"wemeanthatsignificantdevelopmenteffortisrequiredinorderfortheprojecttopassallstagesofthesoftwaredevelopmentprocess.
Incontrasttothis,limitedextensionsofarunninginformationsystemareconsideredpartofthemaintenanceandsupportstages.Addingfunctionalitytoanewstandardsoftwaresystemwillbediscussedinchapter7,aspartofthecustomizingprocess.
Theperspectivetakeninthischapteristhatthestartingpointforthedevelopmenteffortisanapprovedprojectproposal(cf.section2.2.1);
i.e.,amanagerialleveldecisiontolaunchaprojectforbuildingasysteminhousehasbeenmade.Ifnorestrictionsexisted,wecouldsaythattheprojectstartsfromscratch.Intherealworld,however,suchrestrictionsoftenlimitthedegreesoffreedomsubstantially.
4.1StartingwithaProblemSpecification
Constraintsthatanewinformationsystemdevelopmenteffortmayneedtoobserveincludethefollowing:
–Theexistinginformationsystemslandscapehastobeconsidered.Mostlikelythenewsystemwillneedtobeinterfacedwiththecompany'sERPsystemandotherinformationsystems.
–Theplatformonwhichthenewsystemwillrunisprobablyoutsidethescopeoftheproject.Ifthecompany'sexistingsystemsareallbasedonIBMWebSphere,forexample,thenitisunlikelythatadifferentplatformwillbechosenforanewsystemwhichneedstobeintegrated.
–Dependingonhowcloselythesystemistobeconnectedwithexistingsystems,itsarchitecturemayalreadybepredetermined,i.e.,itmayhavetomatchthearchitectureoftheothersystems.
–Manyprojectshavetorununderatightbudgetandmeagerstaffing,limitingthepossibilitiesofwhatcanbedone.
Despitetheseconstraints,thedevelopmentofnewinformationsystemsoffersawidearrayofoptionsandfewerlimitationsthancustomizationprojects.
Anydevelopmentprojectneedsaspecificationoftheproblemstobetackled.Theprojectproposalcontainsaproblemdescription,butthisdescriptionisusuallyjustawrittentextfortheapprovalprocess,toocoarseandnotoperationalenoughtoidentifyrelevantdevelopmenttasks.Forthispurpose,amoreformalizedhigh-levelspecificationofthefuturesystemisrequired.
Severalapproachestodefinesuchhigh-levelspecificationshaveemergedinthepast.Withbusinessprocessesnowadaysbeingthedominatingparadigmforrunningorganizations,thishigh-leveldescriptionoftheISneedsisusuallyadescriptionofabusinessprocessorasub-process.
Theprocessspecificationcouldsimplybeatextualdescriptionofthemajorprocessstepsandtheresourcesinvolved.Sincesemi-formalspecificationshaveadvantagesovertext,variousgraphicalnotationstospecifyabusinessprocessonahighlevelhavecomeintoexistenceovertheyears,includingthefollowing:
»ContextdiagramsinSA(structuredanalysis)[Yourdon1989,p.339]
»Activityanduse-casediagramsinUML(unifiedmodelinglan¬guage)
»Event-drivenprocesschainsinARIS(architectureofintegratedinformationsystems)[Scheer2005]
»BusinessprocessdiagraminBPMN(businessprocessmanage¬mentnotation)
Figure4-1showsjustonepossiblewayofvisualizingabusinesspro¬cess.Asmanynotationsforbusiness-processmodelingexist,thegraphicalconstructsvary.Besideshigh-leveldiagrams,allapproachescompriseasuiteofgraphicalsymbolswithappropriatesemanticsaswellasmethodsandtoolsfordifferentaspectsofmodelingandcon¬struction.Asaprocessisincreasinglyrefined,moresymbolsandmoremeaningsareaddedtothehigh-levelrepresentation.Sincemethodsand
toolswillbediscussedinthefollowingchapter,wedonotintroducemorenotationsatthispoint.
4.2ProcessModelsandISDParadigms
Assumingthatanoperationalproblemspecificationhasbeencreated,developmentoftheinformationsystemcanstart.Therearemanywaystoconductthedevelopmenteffort.Templatesarrangingdevelopmentactivitiesintoaspecifiedorderarecalledsoftwareprocessmodels.(Notethattheterm"process"refersheretosoftwaredevelopmentactivitiesandnottobusinessprocessesasabove.)Thistermcanbedefinedasfollows:
Asoftwareprocessmodelisanorderedsetofactivitieswithasso¬ciatedresultsthatareconductedintheproductionandevolutionofsoftware.Itisanabstractrepresentationofatype
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