Linguistics must set for task a theory of common sense, able to describe the mechanisms of semantic obviousness. From this point of view, the philosophical concept of common sense is redefined here in terms of semiotic process of the norms of the praxis. The detailed analysis of these norms shows that they operate simultaneously in various registers. But the concept of common sense is also specified compared to discursive dynamics, starting from three types of variations (canon, vulgate, doxa). To these typical variations of common sense correspond of functional criteria applicable to the analysis of corpus. The study outlines moreover a praxeologic and pragmatic model of the concept of “genre” and proposes to revalue the role of the speaker starting from the concept of “pluriphonie”. It is a question of specifying, step by step, the idea of community of language.