Community psychiatry, the third psychiatric revolution, is viewed as a new task for psychiatrists. We have to make our community benefit from all the recent psychiatric discoveries. Existing psychiatric facilities have to be reorganized to fulfil this role. This has been done at the Institut Albert-Prévost by the inauguration in 1967 of the evaluation service. This service receives all requests made to the Institut Albert-Prévost, evaluates them and directs the patiént to the appropriate facility. In its first year of existence this service received 13,332 appeals and made 4,841 contacts, evaluating individually 897 patients. From this experience the different roles of the service are described. They are for the patients: information, selection and treatment. For the staff they are: teaching, research, and inter-professional relationship. The addition of this service has brought to our attention the most needed improvements in our structure at the present time, which are the increase of outpatient facilities and the addition of new services to the inpatient service. Also a training program for general practitioners seems to be necessary. Finally, even if it is obvious that our services are to be developed quantitatively, this should not be done at the cost of diminution in quality.