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Intent, Motivation, Applicability, Structure, Participants, Collaborations, Consequences, Implementation, Sample Code, Known Uses, Related Patterns

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Mediator: By encapsulating complex update semantics, the ChangeManager acts as mediator between subjects and observers.

Singleton: The ChangeManager may use the Singleton pattern to make it unique and globally accessible.

Related Patterns of Abstract Factory, Adapter, Bridge, Builder, Chain of Responsibility, Command, Composite, Decorator, Facade, Factory Method, Flyweight, Interpreter, Iterator, Mediator, Memento, Observer, Prototype, Proxy, Singleton, State, Strategy, Template Method, Visitor

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