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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.
1 Use cases organize requirements to form a narrative of how users relate to and use a system. Hence they focus on user goals and how interacting with a system satisfies the goals. 2  Use case flows describe sequences of interactions, and may be worded in terms of a formal model.