This article takes a category that is part of the analysis of the results of the investigation “analytical approach to the operation of interdisciplinary discourses in the Psychology program at UCP regarding bio political production of subjectivities”, in which an analytical approach to the way in which the space of “decidability” is confi gured in the interdisciplinary program of Psychology at UCP is performed. An approximation since the methodology of archeology-Michel Foucault’s genealogy from its institutional documents is done, in order to contribute to the current debate that calls for social sciences and humanities around interdisciplinary. The task then displays an analysis approach that takes as its object the speeches of interdisciplinary in the UCP. It involves them in power-knowledge relations and discusses the power of an anti-interdisciplinary discourse, which will act as possible resistance to what is assumed to be necessary and indispensable.