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Where are the borders between sociological and psychological domains? Was Durkheim an imperialist at the risk of clouding the disciplinary frontiers when he wrote that “psychology is destined to be partly renewed” under the influence of sociological research or when he asserted that “the whole sociology is a psychology” ? In fact, the evolution of perceptions about what is sociological and what is not raises the delicate problem concerning the definition of the “social”. This article argues that, in order to raise the scientific autonomy and to increase its field of intelligibility, sociology must accept the diversity of the range of its observation. Within the list of sociologically studied behavioural variations it must include inter-individual and intra-individual variations that, until now, have been left to psychology.