Adding execution specifications in sequence diagrams

In sequence diagrams, you can add execution specifications to lifelines to show the start and finish behaviors or flow of interactions to visually represent interactions in applications. Execution specifications represent the execution of behaviors.
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 can nest an execution specification to indicate nested behavior in a call sequence. A nested execution specification overlaps an existing execution specification, and enables you to distinguish exactly where the activity associated with each message starts and finishes.

Related concepts
Sequence diagrams
Interaction frames
Execution specifications in sequence diagrams

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