Every actor and object included on a sequence diagram must be included as an actor and an object on a communication diagram, and vice versa.

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Every actor and object included on a sequence diagram must be included as an actor and an object on a communication diagram, and vice versa. This is because the communication diagram is a more detailed view of the sequence diagram, and it shows the specific messages that are sent between the actors and objects.

Every Actor and Object Included on a Sequence Diagram Must