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Alain Trognon retraces the history of interlocutory logic by establishing the role that Connexions has played in the constitution of this theory. Interlocutory logic is a theory of dialogical communication, that is, of the mode of communication which is specific to the human species. The very first versions of this theory were published by Connexions, which subsequently accompanied all the important moments in the elaboration of interlocutory logic. In doing so, Connexions may be said to have been a decisive agent of the profound transformations affecting the human and social sciences in the last quarter of the 20th century.