This research focuses on the levers for developing cross-disciplinary inter-professional cooperation and their impact on the user's care pathway, in particular by minimizing user disruptions. It is based on the implementation of change within an association in the medico-social sector. Observation, then analysis of the structures and professionals, via a longitudinal case study, highlighted the cooperation difficulties between all the professions, in particular specialized educators and workshop instructors. The researchers analyzed decisions to change organizational structure and behavior. The process gradually led professionals to work together more effectively. This conduct to tangible improvements in the collective work organization, to the benefit of both professionals and users.