Resizing and reordering execution occurrences

In Unified Modeling Language (UML) sequence diagrams, an execution occurrence automatically resizes vertically to indicate the time during which a participant is active. The top of the execution occurrence aligns at the point where the message is received and initiates the behavior; the bottom aligns with the finish of the behavior during an interaction. If you resize the execution occurrence across any messages and fragments, the execution occurrence reorders in the interaction.

You must have a sequence diagram that contains at least one lifeline with an execution occurrence open in the diagram editor.
Restriction: You cannot resize an execution occurrence that has a return message attached to it.
To resize and reorder an execution occurrence, in the interaction frame, complete one of the following steps:
Note: During a reorder, if you resize the execution occurrence upward, the start point of the execution occurrence appears before the message and fragments that you crossed. If you resize the execution occurrence downward, the finish point of the execution occurrence appears after the message and fragments that you crossed.

Parent topic: Adding execution occurrence to interactions

Related concepts
Execution occurrences

Related tasks
Creating execution occurrences

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