Realizing extension use cases with AOP

The extension use case adds additional behavior to a base use case without changing it. We had no mainstream programming language supporting the implementation of extensions as we now get with Aspect-Oriented Programming. Aspect-Oriented Programming provides the ability to modularize and weave the representation of crosscutting concerns. This paper focuses on the extension of UML for modeling and realizing the use case extension relationship which AOP addresses. An example of modeling and implementing extension use case with AOP is presented.