Indicate an extends relationship between two use cases

  1. In a use case diagram, drag an Extends shape onto the drawing page.

  2. Glue the Extends endpoint End point image, which is plus sign in a green square without an arrowhead to a connection point Connection point image - blue X on the use case providing the extension.

  3. Glue the Extends endpoint with an arrowhead to a connection point on the base use case.

  4. Double-click the Extends shape to open the UML Generalization Properties dialog box. Add the property values, and then click OK.

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