Abstract
Regulative rules like social and legal rules and constitutive rules of games and language are in force contingently, and due to human activity. On standard views like Reinach's or Hart's, for rules to be in force is either for a legislative authority to have enacted them or for people to accept them. But what kind of attitude is acceptance of a rule? In this talk I will start working towards an answer to this question by discussing constraints on possible answers and the merits and shortcomings of available views.