Please note : This help page is not for the latest version of Enterprise Architect. The latest help can be found here.


Regions can be created in Composite States or State Machines on a State Machine diagram. Regions indicate concurrency, such that a single State is active in each region. Multiple transitions can occur from a single event dispatch, so long as similarly triggered transitions are divided by Regions.

How to

To create a Region in a Composite State or State Machine element




Right-click on the element, and select the Advanced | Define Concurrent Substates context menu option.

The State Regions dialog displays.



Create the Regions of a State, which can be named or anonymous.

Press (Enter) to save each new State Region.



Click on the Close button.



Changes to the partitions are committed when the diagram is saved; if you want to undo the partition changes, reload the diagram without saving

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