GNS theory
role-playing game theory

GNS theory is an informal field of study developed by Ron Edwards which attempts to create a unified theory of how role-playing games work. Focused on player behavior, in GNS theory participants in role-playing games organize their interactions around three categories of engagement: Gamism, Narrativism and Simulation.
The theory focuses on player interaction rather than statistics, encompassing game design beyond role-playing games. Analysis centers on how player behavior fits the above parameters of engagement and how these preferences shape the content and direction of a game. GNS theory is used by game designers to dissect the elements which attract players to certain types of games.
History
GNS theory was inspired by the threefold model idea, from discussions on the rec.games.frp.advocacy group on Usenet in summer 1997. The Threefold Model defined drama, simulation and game as three paradigms of role-playing. The name "Threefold Model" was coined in a 1997 post by Mary Kuhner outlining the theory. Kuhner posited the main ideas for theory on Usenet, and John H. Kim later organized the discussion and helped it grow.
In his article "System Does Matter", which was first posted to the website Gaming Outpost in July 1999, Ron Edwards wrote that all RPG players have at least one of three perspectives.
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This entry incorporates text from “GNS theory” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.