A system boundary is a rectangle that you can draw in
a use case diagram to separate the use cases that are internal to
a system from the actors that are external to the system. A system
boundary is an optional visual aid in the diagram; it does not add
semantic value to the model.
Before you can modify a use case diagram, you
must have a UML modeling project open in the Modeling perspective.
To add a system boundary to a use case diagram:
- Open a use case diagram.
- In the diagram editor, right-click the diagram; then
click .
- Resize the rectangle so that it encloses the diagram
elements in the use case diagram.
- To place the rectangle behind the diagram elements, right-click
the rectangle; then click .