Adding guard conditions to transitions

In UML modeling, a guard condition is a boolean condition that is evaluated when a transition initiates. A transition with a guard condition occurs when the guard condition is evaluated to be true.

Before you begin

Before you can add a trigger to a transition, you must have a state machine diagram open in the Modeling perspective.

Procedure

Right-click a transition; then click Add UML > Guard Condition.
In the parentheses beside the transition name, describe the guard condition and press Enter.

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