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1、WRITINGEFFECTIVEUSECASES(**PRE-PUB.DRAFT#3**)AlistairCockburnHumansandTechnologycopyrightA.Cockburn,1999-2000Addison-Wesleydate:2000.02.21iii1PREFACEMoreandmorepeoplearewritingusecasestodescribebusinessprocessesandthebehavioralrequirementsforsoftwaresystems.Itallseemseasyenough-ju
2、stwriteaboutusingthesystem.Facedwithwriting,however,onesuddenlyasks,"ExactlywhatamIsupposedtowrite-howmuch,howlittle,whatdetails?"Thatisadifficultquestiontoanswer.Theproblemisthatwritingusecasesisfundamentallyanexerciseinwritingproseessays,withallthedifficultiesinarticu-latinggood
3、thatcomeswithprosewritingingeneral.Itishardenoughtosaywhatagoodusecaselookslike,butwereallywanttoknowsomethingharder:howtowritethemsotheywillcomeoutbeinggood.ThesepagescontaintheguidelinesIuseinwritingandincoaching:howapersonmightthink,whattheymightobserve,toendupwithabetterusecas
4、eandusecaseset.Iincludeexamplesofgoodandbadusecases,plausiblewaysofwritingdifferently,andbestofall,thegoodnewsthatausecaseneednotbebesttobeuseful.Evenmediocreusecasesareuseful,moreusefulthanmanyofthecompetingrequirementsfilesbeingwritten.Sorelax,writesomethingreadable,andyouwillha
5、vedoneyourorganizationaservicealready.1AudienceThebookisaimedatprofessionalswhoreadandstudyalone.Itisorganizedasaself-studyguide.Itcontainsintroductory,intermediateandadvancedconcepts,examples,reminders,andexerciseswithanswers.Projectandusecasecoachesshouldfindsuitableexplanations
6、andsamplestoshowtheirteams.Coursedesignersandinstructorsshouldbeabletobuildcoursematerialaroundthebook,issuingreadingassignmentsasneeded.However,asIincludeanswerstomanyexercises,theywillhavetoconstructtheirownexammaterial:-).OrganizationThebookisorganizedintofourmainparts:introduc
7、tiontousecases,theusecasebodyparts,frequentlyaskedquestions,remindersforthebusy,andendnotes.Chapter.-Page2TheIntroductiontoUseCasescontainsaninitialpresentationofkeynotions,togetthediscussionrolling:"Whatdoesausecaselooklike?","WhendoIwriteone?",and"Whatvaria-tionsarelegal?"Thebri
8、efansweristhattheylookdifferentde
