Interaction frames

In sequence diagrams and communication diagrams, an interaction frame provides a context or boundary to the diagram in which you create diagram elements, such as lifelines or messages, and in which you observe behavior.

As the following figure illustrates, an interaction frame is displayed as a rectangular area with a heading label, or pentagon descriptor figure, in the top left corner.

A rectangular interaction frame is displayed with a heading label in its top left corner.

The frame and its contents represent an interaction in a sequence diagram or communication diagram. The heading label of the interaction frame is the name of the interaction that the diagram represents. In sequence diagrams, a frame can represent combined fragments, which represent scenario constructs, and interaction uses, which represent an interaction within an interaction.

Related tasks
Modeling the sequence of messages between objects in an interaction in UML

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