On the one hand, an ever increasing demand, on the other, widespread agreement that the profession in is the grip of a crisis. The result is that the supply is badly equipped to deal with the demand. What are the origins of this crisis ? Does it run as deep as the very foundations and identity of psychiatry itself ? In particular, what can be done to transform this natural diversity into a real strength ? Psychiatrist and psychoanalyst, Marie-Christine Hardy-Baylé works at the André-Mignot hospital, and is a professor of medicine at the University of Saint-Quentin-en-Yvelines. She heads the Association for the Promotion of Public Health of Yvelines Sud. A hospital director, Christine Bronnec, is in charge of the ANEAS project to evaluate psychiatric needs, and is co-president of the Association for the Promotion of Public Health of Yvelines Sud.