Wittgenstein’s writings on “rule-following” remain an important—and sharply contested—part of his later thought. The reference to “rules” in those writings was both broader and more basic than the use of that term in most discussions of practical reasoning or legal theory. Wittgenstein’s use of “rule” refers to all normative constraints which apply over an indefinite variety of cases, to practices where our actions might be said to be guided, to situations where characterizing actions as “correct” or “incorrect” makes sense. However, “[h]e aimed not to write a book on rules but to examine specific problems arising out of insights into the normative nature of a language, of logic and of reasoning.” He focused in particular on normative practices that on the surface do not seem troubling or difficult to understand: for example, using a word correctly, understanding a signpost, and continuing a simple mathematical series. In such examples, the interesting question is not whether a particular response or continuation is right or wrong; Wittgenstein specifically chose examples where there would be consensus on that issue. Wittgenstein’s question is what is it about the rule or about ourselves which makes our responses right or wrong (or which justifies us in reaching that evaluation)?