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In the Unified Modelling Language, use cases are provided as a way of summarising the requirements on a system. They are defined informally as specifications of sets of sequences of actions, and several relationships between use cases are informally defined. Dependable, tool-supported software development necessitates precise definitions of all these concepts but the topic has so far received little attention in the literature, beyond what is present in Catalysis. This paper explores how these notions can be formalised whilst staying as close as possible to the UML standard, makes some suggestions and raises further questions.

On Use Cases and Their Relationships in the Unified Modelling Language