3.5. The Use Case Diagram
A use case model describes the services a system offers as well as the users of these services. In contrast to the other UML areas, the use case model elements are very vaguely defined, allowing us a large degree of freedom. An approach model is responsible for concretizing this degree of freedom. The SYSMOD approach in Chapter 2 describes how you find and model use cases for systems.
Use case diagrams look very simple. These diagrams are communication interfaces between system engineers and stakeholders, such as domain experts or future users of the system. Many stakeholders are normally not from the technical environment, but they can still be involved in the modeling, thanks to the simplicity of the use cases. This ...
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