Use Case Diagram, Activity Diagram and Functional Modeling Unit 4 Lecture 1

A use case diagram is a dynamic or behavior diagram in UML. Use case diagrams model the functionality of a system using actors and use cases. Use cases are a set of actions, services, and functions that the system needs to perform. 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.

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[siyangubane]

All use cases stem from the question you ask: The system must allow the user to

The answers to this question are the use cases.