Our research is a didactic engineering of cooperative type (Sensevy and Haberdasher, 2007) which attempts to make live in a 2nd year of middle school, the complexity of the circus, work (Chevallard, on 1995,) at the "risk of the art" (Wallon, on 2002), between "games of Ilinx and games of Mimicry" (Caillois, on 1958). By the analysis of the verbal and physical interactions, we analyze the impact of serious games that attempt to make come the class to the circassian epistemic games. The Joint Action Theory in Didactics (TACD) establishes the theoretical foundations of the construction of our research tools and our methodology that pursues the "knowledges circulation between professor and pupils". (Loquet, Roncin and Roesslé, on 2007)
