Use cases describe interaction scenarios between a system to be designed and users of the system. The authors support these scenarios with maps to provide a visual notation for prose use cases and a means of extending the cases into high-level design. This text is a study of use case maps and their applications to high level design of systems. It also shows readers how to use the maps in a co-ordinated way with other standard requirements/design models for object-oriented and real-time systems (such as use cases, class relationship diagrams, collaboration graphs and interaction sequence diagrams).