Resizing and reordering execution occurrences

In 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.

Restriction: You cannot resize an execution occurrence that has a return message attached to it.
To resize and reorder an execution occurrence:
  1. Open a sequence diagram that contains at least one lifeline with an execution occurrence.
  2. In the interaction frame, complete one of the following steps:
    • To resize an execution occurrence, drag the handles up or down without crossing any messages and fragments.
    • To resize a nested execution occurrence, drag the handles up or down to the maximum vertical limit of the execution occurrence that it is nested on.
    • To reorder an execution occurrence across existing messages and fragments, drag the handles up or down.
    Note: During a reorder, if you resize the execution occurrence up, the start point of the execution occurrence appears before the message and fragments that you crossed. If you resize the execution occurrence down, the finish point of the execution occurrence appears after the message and fragments that you crossed.

Parent topic: Showing the flow of control in interactions by using execution occurrences

Related concepts
Execution occurrences

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