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1、Designinganddevelopingapplicationsforz/OS8.1ApplicationdesignersandprogrammersThetasksofdesigninganapplicationanddevelopingonearedistinctenoughtotreateachinaseparatetextbook.Inlargerz/OSsites,separatedepartmentsmightbeusedtocarryouteachtask.Thischapterprovidesanoverviewofthesej
2、obrolesandshowshoweachskillfitsintotheoverallviewofatypicalapplicationdevelopmentlifecycleonz/OS.Theapplicationdesignerisresponsiblefordeterminingthebestprogrammingsolutionforanimportantbusinessrequirement.Thesuccessofanydesigndependsinpartonthedesigner’sknowledgeofthebusinessi
3、tself,awarenessofotherrolesinthemainframeorganizationsuchasprogramminganddatabasedesign,andunderstandingofthebusiness’shardwareandsoftware.Inshort,thedesignermusthaveaglobalviewoftheentireproject.Anotherroleinvolvedinthisprocessisthebusinesssystemsanalyst.Thispersonisresponsibl
4、eforworkingwithusersinaparticulardepartment(accounting,sales,productioncontrol,manufacturing,andsoon)toidentifybusinessneedsfortheapplication.Liketheapplicationdesigner,thebusinesssystemsanalystrequiresabroadunderstandingoftheorganization’sbusinessgoals,andthecapabilitiesofthei
5、nformationsystem.Theapplicationdesignergathersrequirementsfrombusinesssystemsanalystsandendusers.ThedesigneralsodetermineswhichITresourceswillbeavailabletosupporttheapplication.Theapplicationdesignerthenwritesthedesignspecificationsfortheapplicationprogrammerstoimplement.Theapp
6、licationprogrammerisresponsiblefordevelopingandmaintainingapplicationprograms.Thatis,theprogrammerbuilds,tests,anddeliverstheapplicationprogramsthatrunonthemainframefortheendusers.Basedontheapplicationdesigner’sspecifications,theprogrammerconstructsanapplicationprogramusingavar
7、ietyoftools.Thebuildprocessincludesmanyiterationsofcodechangesandcompiles,applicationbuilds,andunittesting.Duringthedevelopmentprocess,thedesignerandprogrammermustinteractwithotherrolesintheenterprise.Theprogrammer,forexample,oftenworksonateamofotherprogrammerswhoarebuildingcod
8、eforrelatedapplicationmodules.Whentheapplicationmodule
