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–Use-cases are a scenario based technique in the um-l which identify the actors in an interaction and which describe the interaction itself.–A set of use cases should describe all possible interactions with the system.–Sequence diagrams may be used to add detail to gyuse cases by showing the sequence of event processing in the system. Source:http://en.docsity.com/en-docs/Requirements_Engineering_Process-Softwarre_Engineering-Lecture_Slides_
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