The Concepts
This section introduces UML, object-oriented, database, and other concepts (such as the business modeling concepts, which are based on the Rational Unified Process developed by Rational Software Corporation). For a more complete discussion and more rigorous definitions of UML concepts, see Booch et al. [1999].
Actor— an external person or system that interfaces with (that is, uses or is used by) the system
Use case— a complete flow of actions, initiated by an actor, that the system performs to provide value to that actor
Business actor— an actor that is external to the business
Business use case— a use case, initiated by a business actor, that the business performs
Business worker— an actor that is internal to the business whose ...
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