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UML Use Case Diagrams. Use case diagrams are usually referred to as behavior diagrams used to describe a set of actions (use cases) that some system or systems (subject) should or can perform in collaboration with one or more external users of the system (actors).
A use case is a methodology used in system analysis to identify, clarify, and organize system requirements. In this context, the term system refers to something being developed or operated, such as a mail-order product sales and service Web site.