This book is a reflection on the contemporary problems posed by the act of communication. The act, based on an implicit contract of the laws which engage the interlocutors in the co-enunciation of the speech. It takes up the three traditional paradigms of communication. In Sausurrian linguistics, communication is limited to the transmission of the message. Through the dichotomy "language-speech", Saussure thus evacuates the speaking subject and completely ignores the context of communication. Here, the process of meaning is found in the content. The pragmatics, evoked in this work, re-establishes the speaking subject, at the same time as it consecrates the success of the act of communication through the context. By the fact of speaking, one accomplishes an act. Austin is evocative on this subject. Pragmatics thus institutes the acts of language which are: performative, permissive, locutionary... Communication leaves the statement towards the enunciation, the said towards the said, and the process of meaning is in the "praxis": "The meaning of a word will be its use in a given context, its place in a calculation".