The best-known theories on interdisciplinarity in the health and social care field seek to identify personal characteristics and organizational predispositions favourable to interprofessionnal collaboration. This paper proposes a reversal of this positioning through the theorization of interdisciplinarity in the health and social care field as a condition of the work of its professionals rather than one of their peculiar attributes. To achieve this reversal, we set out the epistemological foundations of the current debate on interdisciplinarity.