For example, if you have a use case for booking a hotel room, you can use the extend relationship to show that the user can also cancel the booking or modify the booking under certain conditions.

UML 1.3 has made a pair of changes concerning the use-case relationships; one is to move include and extend that used to be stereotypes of the generalization into those of the dependency, and the ...

This paper suggests a simple use-case modeling method integrating the method of use-case modeling in UML and OML. The method gets rid of generalization, extend and including relationships among use ...