Defining the boundaries of a system

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 begin

Before you can modify a use-case diagram, you must have a UML modeling project open in the Modeling perspective.

Procedure

  1. Open a use-case diagram.
  2. In the diagram editor, right-click the diagram; then click Add > Rectangle.
  3. Resize the rectangle so that it encloses the diagram elements in the use-case diagram.
  4. To place the rectangle behind the diagram elements, right-click the rectangle; then click Format > Order > Send to Back.
Related concepts:
Use-case diagrams
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