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

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