In sequence diagrams, an execution specification is created automatically
when you create a synchronous or an asynchronous message on a lifeline. You
can also manually create an execution specification to show the start and
finish behavior in an interaction.
You must have a sequence diagram open that contains lifelines and
messages.
To create an execution specification manually:
- In the Palette, click Execution
Occurrence.
- Click the target lifeline at a position that does not have an existing
execution specification.
If you want to delete an execution specification, it cannot have
a return message.
Note: To create a nested execution specification,
click the target lifeline at a position that has an existing execution specification.