Emeline Roy, ATER at the INSPE in Aix-Marseille, doctoral candidate at UR 4671 ADEF-GCAF Aix-Marseille University: Didactic Applied Arts didactic: the development of teaching environments designed for devolution. In its Broussaldienne sense, the teaching medium is an antagonistic system (Brousseau, 1998). It corresponds to everything that acts on the pupil or/and what the student acts on, but also everything that acts on the teacher and what the teacher acts on. Devolution refers to the ensem...