[use case][addison wesley][pdf] writing effective use cases

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1、WRITINGEFFECTIVEUSECASES(**PRE-PUB.DRAFT#3**)AlistairCockburnHumansandTechnologycopyrightA.Cockburn,1999-2000Addison-Wesleydate:2000.02.21i1PREFACEMoreandmorepeoplearewritingusecasestodescribebusinessprocessesandthebehavioralrequirementsforsoftwaresystems.Itallseemsea

2、syenough-justwriteaboutusingthesystem.Facedwithwriting,however,onesuddenlyasks,"ExactlywhatamIsupposedtowrite-howmuch,howlittle,whatdetails?"Thatisadifficultquestiontoanswer.Theproblemisthatwritingusecasesisfundamentallyanexerciseinwritingproseessays,withallthedifficu

3、ltiesinarticu-latinggoodthatcomeswithprosewritingingeneral.Itishardenoughtosaywhatagoodusecaselookslike,butwereallywanttoknowsomethingharder:howtowritethemsotheywillcomeoutbeinggood.ThesepagescontaintheguidelinesIuseinwritingandincoaching:howapersonmightthink,whatthey

4、mightobserve,toendupwithabetterusecaseandusecaseset.Iincludeexamplesofgoodandbadusecases,plausiblewaysofwritingdifferently,andbestofall,thegoodnewsthatausecaseneednotbebesttobeuseful.Evenmediocreusecasesareuseful,moreusefulthanmanyofthecompetingrequirementsfilesbeingw

5、ritten.Sorelax,writesomethingreadable,andyouwillhavedoneyourorganizationaservicealready.1AudienceThebookisaimedatprofessionalswhoreadandstudyalone.Itisorganizedasaself-studyguide.Itcontainsintroductory,intermediateandadvancedconcepts,examples,reminders,andexerciseswit

6、hanswers.Projectandusecasecoachesshouldfindsuitableexplanationsandsamplestoshowtheirteams.Coursedesignersandinstructorsshouldbeabletobuildcoursematerialaroundthebook,issuingreadingassignmentsasneeded.However,asIincludeanswerstomanyexercises,theywillhavetoconstructthei

7、rownexammaterial:-).OrganizationThebookisorganizedintofourmainparts:introductiontousecases,theusecasebodyparts,frequentlyaskedquestions,remindersforthebusy,andendnotes.Chapter.-Page2TheIntroductiontoUseCasescontainsaninitialpresentationofkeynotions,togetthediscussionr

8、olling:"Whatdoesausecaselooklike?","WhendoIwriteone?",and"Whatvaria-tionsarelegal?"Thebriefansweristhattheylookdifferentdepe