[The " Agent de quartier " : information and help service to the community.]

This article describes the process of instituting in a community a mental health preventive program that had originated in a third line psychiatric institution. The author describe the different stages of the project as much from the point of view of the workers'experiences, the ideological evolution, the organisational modalities as from its impact on the network of the mental health distribution services. The implantation of this new service was not easy for the community nor for the initiators. Luckily, the efforts encountered were worth while since the need for such a service is now recognised.