The collaboration diagram is the only dynamic model that illustrates the milestones in the lifetime of one class of objects in its entirety.

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The collaboration diagram, also known as a communication diagram, illustrates interactions between objects and their relationships, focusing on the structural organization of objects that send and receive messages. However, it does not exclusively illustrate the milestones in the lifetime of one class of objects in its entirety; sequence diagrams and state machine diagrams also capture dynamic behavior in the system.

The Collaboration Diagram Is the Only Dynamic Model That Illustrates