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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).
Due to these benefits, Use Cases are now becoming customary as a method for gathering requirements (Wyder, 1996). A Use Case collects the various scenarios that can happen within the software system. Use Cases are in text form, but are known to be diagrams, flow charts, sequence charts, Petri charts, or programming languages.