Fundamentals of UML Diagrams

A diagram is the graphical presentation of a set of elements. UML has a lot of different diagrams. Read this section, and make sure you can differentiate between different diagrams.

2. Using the <> Relationship

This feature encourages re-use. If a use-case needs the functionality of another use-case in order to perform its task, it "uses" the 2nd use case. The relationship is drawn as a line with arrowhead pointing to the use case that is being "used" as shown in Figure 2.5.

Figure 2.5: A < > Relationship in a Use Case Diagram