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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 model is a business analysis presentation of the steps defining the interactions between a user (called an actor) and a system (usually a computer system). It details the interactions and sets the expectations of how the user will work within the system.