This chapter develops a conceptual framework for talking about the notions of rules, norms and principles. It is hoped that this framework will allow us to properly distinguish between merely verbal and substantive issues concerning these notions. It is argued that the substantive debate about rules is not about whether a rule exists, or what a rule is, but about what it takes for a rule to be a norm on behavior. One result of this way of looking at things is a recasting of the problem about rule-following: what is it that constitutes correct following of a rule in a case where there is no explicit intention to conform one's behavior to a rule. Finally, some issues concerning the general problem of normativity of both rules and rule-following is discussed in the chapter.