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Research into group problem-solving carried out since 1920 has supported the idea that this kind of group provides a natural disposition of collective rationality. This idea has been independently confirmed by social psychology of cognitive development and by formal logic. Examining these properties of group problem-solving, shows that “language-games” of “free discussions” can provide an adequate synthesis of these phenomena. A free discussion belongs to level 2 (or “interaction order” or “dialogical order”) of the four levels of analysis in social psychology proposed by Doise. The authors adopt Moscovici’s definition of “psychosocial look” in order to affirm that level 2 constitutes an interface in which rationality – including scientific knowledge – shapes subjectivity penetrating the collective mind.