UML Tutorials - Herong's Tutorial Examples - Version 1.01, by Dr. Herong Yang
Activity Diagram - Decision Notation
This section describes the Decision Notation used in a UML Activity Diagram. A Decision Notation represents a decision action that decides which action path to take next based on certain conditions.
A Decision Notations is a graphical notation used in a UML Activity Diagram to represent a decision action that evaluates certain conditions and decides which action path to continue the execution.
A Decision Notation is drawn as a small diamond shape with one incoming control flow and multiple outgoing control flows.
Each outgoing control flow should be labeled with the condition that leads to this flow.
For example, the decision action performed after the "Receive Order" action to check the stock
can be drawn as a Decision Notation in a UML activity diagram as shown below:
Last update: 2014.
Table of Contents