Well-designed interdisciplinary exchanges undeniably enrich the practices of all concerned, provided that transparency and non-hierarchical partnership are the order of the day. Strengthening the specific skills of each is another necessary factor in promoting a fair interdisciplinarity: the more the professional is clear about his or her skills, the more benevolent and welcoming his or her partners can be, for the greater benefit of users, pupils or patients. This book presents various clinical and theoretical interfaces: collaboration with teachers, psychomotricians and parents. Complementarities and differences between verbal language and mathematical language on the cognitive level, language play with heraldry, ethical issues and psychodynamic interface. These are all areas of partnership that enrich both professionals and their users by reinforcing their qualities as subjects while respecting their life process and existential diversity. Optimal opportunity for adjustment and tuning for the benefit of all.