DEV475 Mastering Object-Oriented Analysis and Design with UML ...

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DEV475 Mastering Object-Oriented Analysis and Design with UMLWhat Is System Behavior?What Is System Behavior?• System behavior is how a system acts andreacts.• It is the outwardly visible and testable activity ofa system.• System behavior is captured in use cases.• Use cases describe the system, itsenvironment, and the relationship between thesystem and its environment.Mastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 8• No system exists in isolation. Every system interacts with people or automatedsystems for some purpose. These interactions result in some sort of predictableresult. This predictable result is system behavior.• Use cases are the mechanism for capturing the desired behavior for the systemthat is under development, but they do not specify how the behavior is to beimplemented.• The UML specifies a model for communicating system behavior — the Use-CaseModel.3 - 8
Module 3 - Requirements OverviewMajor Concepts in Use-Case ModelingMajor Concepts in Use-Case Modeling• An actor represents anything that interacts withthe system.Actor• A use case is a sequence of actions a systemperforms that yields an observable result ofvalue to a particular actor.UseCaseMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 9An actor represents a coherent set of roles that users of the system play wheninteracting with these use cases. Typically, an actor represents a role that a human, ahardware device, or even another system plays with a system.A use case is a sequence of actions a system performs to yield an observable resultthat is of value to a particular actor. A use case describes what a system does, but itdoes not specify how it does it.3 - 9
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