  Marmor (2009) also questions Lewis’s focus on coordination problems. Marmor emphasizes actual games, such as chess, rather than the “games” primarily studied by game theorists, such as Prisoner’s Dilemma. According to Marmor, the rules of chess are conventions that do not solve a coordination problem. Chess playing activity does not involve coordinating one’s actions with those of other players, in anything like the sense that driving on the right side of the road (rather than the left) involves coordination among agents. Drawing on John Searle’s (1969) discussion of “constitutive rules,” Marmor argues that Lewis has overlooked an important class of conventions, which Marmor calls “constitutive conventions,” modeled after the rules of a game. Roughly, a constitutive convention helps “constitute” a social practice, in the sense that it helps define what the practice is and how to engage in it correctly. Marmor offers a generalized analysis designed to accommodate both Lewisian conventions and constitutive conventions. The analysis resembles Lewis’s, but it makes no mention of coordination problems, and it contains no reference to common knowledge.