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.

You must have a least two use cases in a diagram.

To add an extend relationship:

  1. In the Palette, in the Use Case Diagram drawer, click Extend.
  2. Click the extension use case and drag the arrow cursor to the base use case.
  3. On the pop-up menu, click Create new Extension Point.
The extend relationship is added between the base use case and the extension use case and a new extension point is added to the Extension Points compartment of the base use case.
Related concepts
Extend relationships
Extension points
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