42 use case context diagram
The use case diagram provides a richer scope representation than the context diagram because it provides a high-level look at the system's capabilities, not just at its external interfaces. There is a practical limitation, though. 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. In this context, a "system" is something being developed or operated, such as a web site. A popular form of the use-case diagram may help summarize the interaction of actors with the system. This diagram is called a top-level use-case diagram, but as it's very similar to a type of diagram that predates UML; often you'll see it called by its traditional name: context diagram. This type of diagram, shown in Figure 8-7, displays ... Use case context diagram