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Behavioral UML diagrams. A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved.
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.