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Both a science and a social practice, psychosociology does not dissociate the action and the clinical aspect from the conditions of production of knowledge in which it participates. The project of knowledge it concerns does not aim to fabricate reified objects that can be manipulated from the outside. Its knowledge is a knowledge of self, others, relationships, collective functioning, and processes. It is built up by the work of collective situational analysis in order to understand and transcend practical, psychological, organizational, and theoretical difficulties. The validation paradigm of its claims is that of the clinical testing of hypotheses in a situation, through the work of speaking with others.