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We single out two models of what a rule is according to Wittgenstein, already in the Tractatus : the projective rule (or translation rule) and the operative rule (or calculation rule). In the Tractarian framework, according to which elementary propositions are independant, these two concepts are equivalent. Wittgenstein’s difficulty with the idea of a phenomenology in the early Thirties can be seen as the result of his exclusive insistence on the projective rule. These difficulties were resolved through the discovery of thepossibility of an agreement between the two models, with the predominance of the operative rule.