The author is focused on the analysis of communication studies. He goes back to the seventies when communication studies responded more to a model of instrumental knowledge than to a project of comprehension in order to point out that in the last decades this model has been overtaken by social process as well as by displacements on theoretical fields. This is so, as far as communication and information (together with technological innovations: satellites, computer science, video processors) have occupied the central point in the configuration of new society models and they have caused deep transformations in daily culture of the majority. Within this frame, the author underlines the importance of the variety of disciplines in communication studies.