Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Presentation-abstraction-control (PAC) is a software architectural pattern, somewhat similar to model-view-controller (MVC). PAC is used as a hierarchical structure of agents, each consisting of a triad of presentation, abstraction and control parts. The agents (or triads) communicate with each other only through the control part of each triad. It also differs from MVC in that within each triad, it completely insulates the presentation (view in MVC) and the abstraction (model in MVC), this provides the option to separately multithread the model and view which can give the user experience of very short program start times, as the user interface (presentation) can be shown before the abstraction has fully initialized. A subset or variation of PAC under the name Hierarchical-Model-View-Controller (HMVC) was published in an article in JavaWorld Magazine, the authors apparently unaware of PAC which was published 13 years earlier.

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