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Presentation–abstraction–control (PAC) is a software architectural pattern. It is an interaction-oriented software architecture, and is somewhat similar to model–view–controller (MVC) in that it separates an interactive system into three types of components responsible for specific aspects of the application's functionality. The abstraction component retrieves and processes the data, the presentation component formats the visual and audio presentation of data, and the control component handles things such as the flow of control and communication between the other two components .
In contrast to 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.
See also 
- Hierarchical model–view–controller
- Model view viewmodel
- Presenter First
- Drupal web application framework
- Coutaz, Joëlle (1987). "PAC: an Implementation Model for Dialog Design". In Bullinger, H.-J.; and Shackel, B. (ed.). Proceedings of the Interact'87 conference, September 1–4, 1987, Stuttgart, DE. North-Holland. pp. 431–436.
- Buschmann, Frank; Meunier, Regine; Rohnert, Hans; Sommerlad, Peter; Stal, Michael (1996). Pattern-Oriented Software Architecture Vol 1: A System of Patterns. John Wiley and Sons. pp. 145–168. ISBN 0-471-95869-7.
- Calvary, Gaëlle; Coutaz, Joëlle; Nigay, Laurence (1997). "From Single-User Architectural Design to PAC*: a Generic Software Architecture Model for CSCW". In Pemberton, Steven (ed.). Proceedings of the ACM CHI 97 Human Factors in Computing Systems Conference, March 22–27, 1997, Atlanta, GA. pp. 242–249.
- Coutaz, Joëlle (1997). "PAC-ing the Architecture of Your User Interface". DSV-IS’97, 4th Eurographics Workshop on Design, Specification and Verification of Interactive Systems. Springer Verlag. pp. 15–32.
- Markopoulos, Panagiotis (1997). A compositional model for the formal specification of user interface software (pdf). PhD thesis, Queen Mary and Westfield College, University of London. p. 26. Retrieved 2006-05-25.
- Avgeriou, Paris; Zdun, Uwe (2005). "Architectural patterns revisited – a pattern language". Proceedings of 10th European Conference on Pattern Languages of Programs (EuroPlop 2005), Irsee, Germany, July 2005. pp. 1–39.
- Kai, Qian (2009). "Interaction-oriented Software Architectures". Software Architecture and Design Illuminated. Jones and Bartlett Illuminated. p. 200. ISBN 978-0-7637-5420-4.
- Nigay, Laurence; Coutaz, Joëlle (1991). "Building User Interfaces: Organizing Software Agents". ESPRIT '91 Conference. Brussels, Belgium: November 1991.
- Nigay, Laurence (January 1994). Conception et modélisation logicielles des systèmes interactifs : application aux interfaces multimodales (PDF) (in French, with abstract in English). PhD dissertation, 315 pages, University of Grenoble, France. pp. 131–268.
- Nigay, Laurence; Coutaz, Joëlle (1997). "Software Architecture Modelling: Bridging Two Worlds Using Ergonomics and Software Properties". Formal Methods in Human-Computer Interaction. Springer-Verlag. chapter 3, pp. 49–73. ISBN 3-540-76158-6.
- Architectural outline for the game Warcraft as it might be implemented using the PAC Architectural Pattern: Programming of the application PACcraft:Architecture (in French)
- Pattern:Presentation-Abstraction-Control (pattern description)
- PAC description in the Portland Pattern Repository
- WengoPhone is a free software VoIP application that is written using the PAC design pattern.
- HMVC: The layered pattern for developing strong client tiers