In UML modeling, when you draw use case diagrams, you communicate the essence of the system or application without exposing any unnecessary details. It’s generally good practice to hide the complexity of the system, but there are times when you might need to expose details. You can depict these details in their own use cases and connect them to the base use cases, which enables you to reveal information that would otherwise be hidden.
Adding extend relationships to modeling diagrams
In UML modeling, an extend relationship indicates that the extension use case extends the behaviors in a base use case.Creating an extension point for a use case
In UML modeling, you can create extension points for the base use case. These extension points identify where the behavior of an extension use case can be inserted into the base use case.
Parent topic: Specifying the relationships in use case diagrams
Related concepts
Extend relationships
Extension points