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Two extreme types of structure for interaction diagrams:1. Fork diagram 2. Stair diagram1. Fork diagram: Centralized structure1. Much of the behavior is placed in the controlling object that knows all other objects and often uses them for direct questions or commands.2. Controlling object is complex.2. Stair diagram: Decentralized structure1. Delegated responsibility2. Each object only knows a few of the other objects.

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