15 Use Case Diagram Is. Experts recommend that use case diagrams be used to supplement a more descriptive textual use case. 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.
• a picture • describes how actors relate to use cases • and use cases relate to one another. Use case diagrams model the functionality of a system using actors and use cases. Sounds like quite a heavy worded title, doesn't it?
Major elements of the business use case diagram are shown on the picture below.
15 Use Case Diagram Is. The diagram is used to model the system/subsystem of an application. • diagrams are not essential • they are helpful in giving an overview, but only. An actor is usually drawn as a named stick figure, or. A use case diagram is a dynamic or behavior diagram in uml.