7Weidenhaupt K, Pohl K, Jarke M,et al.Scenarios in system development: Current practices[J]. IEEE Software,1998,(3,4):34-45.
8Constantine L,Lockwood L A D.Structure and style in use cases for user interface design[A].Harmelen M V.Object Modeling and User Interface Design[C].Reading(Massachusetts):Addison-Wesley,2001.23-30.
9Cockburn A. Writing effective use cases[M].Reading(Massachusetts):Addison-Wesley,2001.20-38.
10Wiegers K E.Software requirements[M].Redmond(Washington):Microsoft Press,1999.1-76.