Presentation-Abstraction-Control
The PAC architectural pattern defines a structure for interactive software systems in the form of a hierarchy of cooperating agents. Every agent is responsible for a specific aspect of the application's functionality and consists of three components: presentation, abstraction, and control.
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Model-View-Controller (MVC): The PAC pattern is a further development of the MVC pattern. The PAC architecture does not have the model as its core component, but a hierarchical structure of PAC components.
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