Duringthesystemsplanningphase.asystemsanalystconductsa()activitytostudythesystemsrequestandrecommendspecificaction.Afterobtaininganauthonzationtoproceed.theanalystinteractswith()togatherfactsabouttheproblemofopportunity,projectscopeandconstraints,projectbenefits,andestimateddevelopmenttimeandcosts.Inmanycases.thesystemsrequestdoesnotrevealtheunderyingproblem,butonlyasymptom.Apopulartechniqueforinvestigatingcausesandeffectsiscalled(请作答此空)Theanalysthasanalyzedtheproblemoropportunity.definedtheprojectscopeandconstraints,andperformed()toevaluateprojectusability,costs,benefits,andtimeconstraints.Theendproductoftheactivityis().Themaincontentmustincludeanestimateoftime.staffingrequrements,costs,benefits,andexpectedresultsforthenextphaseoftheSDLC
A.fishbone diagram
B.PERT diagram
C.Gantt diagram
D.use case diagram
正确答案是A