Abstract
This paper discusses a debate that is common in the social sciences and in philosophy, but has not yet received an adequate treatment in the field of communication. This is the debate about the opening and the closure of consciousness and of systems, which is an epistemological attitude that underlies the concept of communication, notwithstanding the lack of a theoretical foundation. The paper deals with that debate by means of Niklas Luhmann’s theory of social systems, the cybernetics of Heinz von Foerster and the philosophies of Jurgen Habermas, Gilles Deleuze and Maurice Merleau-Ponty. It is divided into nine topics and ends with a summary and a short conclusion on the present state of the theoretical debate. Key words: Niklas Luhmann, Maurice Merleau-Ponty, operational closure.
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