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Sequence Diagram
A sequence diagram describes a pattern of interaction among objects, arranged in a chronological order; it shows the objects participating in the interaction by their "lifelines" and the messages that they send to each other.

A sequence diagram graphically depicts the details of the interaction among business workers, business actors, and how business entities are accessed, during the performance of a business use case. A sequence diagram briefly describes what the participating business workers do, and how the business entities are manipulated, in terms of activations, and how they communicate by sending messages to one another.

A sequence diagram of part of an Individual Check-in business use case.

The same information that can be found in a sequence diagram can be presented in a collaboration diagram instead (see Guidelines: Collaboration Diagram in the Business Object Model).

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