Use Case Extension Points |
The Extension Points of a Use Case show exactly where an extending use case is allowed to add functionality. You define the extension points in its property page.
For example, a Take Payment use case may have the extension points: Cash and Credit. This will allow you to extend the Take Payment use case into Take Cash Payment and Take Credit Payment.
To the right of the extension name, there is a button
with ellipses on it. Use
this button to map to another extension point that you've already defined
in your project.
The extension points are shown on your diagram as part of the Use Case object. When you use the extends link to show that the Take Cash Payment use case extends the Take Payment use case, you will specify that it extends the Take Payment use case at the Cash extension point.
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