Use extension points to specify the point of an extended Use Case where an extending Use Case's behavior should be inserted. The specification text can be informal or precise to define the location of the extension point.
Note: Conditions to apply that extending Use Case and the extension point to use should be attached as a note to the extend relationship.
To work with extension points, follow the steps below:
| 1. | Right-click on the Use Case element. The context menu displays. |
| 2. | Select the Advanced | Edit Extension Points... menu option. The Use Case Extension Points dialog displays, listing defined points for that Use Case. |
| 3. | Select an extension point in the list and click on the appropriate button to add, edit or remove an extension point. |