Partitions
An activity diagram can be divided into partitions. Each partition contains nodes or actions as well as the flows between these elements.
You can use partitions to organize tasks or to specify the element responsible for implementation of multiple tasks.
Creating a Partition
To create a partition in the activity diagram:
1. Click the
Partition button

in the object insert toolbar.
2. Specify its name.
3. Indicate the element represented by the partition. This is the element which implements elements of the partition. It can be an actor, class or component.
4. Click OK.
Partition Properties
The Contained Elements tab of the partition properties dialog box presents elements executed in the partition.
The Complements tab enables attachment of the partition to the constraints that are implemented.