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The author reflects on what he has learned from his twofold experience as a teacher of experimental social psychology at university and as a psychosociological consultant, notably within the framework of the ARIP. This reflection leads him to make quite a radical distinction between a scientific discipline like social psychology (with which applied social psychology is associated here) and a social practice like psychosociology. They have little in common in spite of the historical contingencies which encouraged us to associate them. Although they both produce a body of knowledge, they differ not only in respect of the values they mobilize, but also in respect of the place these values have in this body of knowledge and in interventions: epistemic values and values linked to objectives of action in the first case; social values in the second. These distinctions help us to understand certain aspects of the evolution of a social practice such as psychosociology since its arrival in France in the 1950s.