Texte intégral accessible uniquement aux membres de l'Université de LorraineThe affectio societatis remains a useful notion. The judges and the authors take into account its presence to determine the nullity, the fictivité and the qualification of "company" or "partner". The affectio societatis is a criterium used on two plans. On one side, the affectio societatis is a criterion of validity of the social orders. In its absence, the nullity of the company can be pronounced and the fictivité of the grouping can be recognized. In contrast, its presence returns more than doubtful the validity of companies created in sleep. On the other hand, the affectio societatis is a criterion of qualification of the contract. In the first place, it interven...