The "Psi-La Boussole" project constitutes a model of coordination of services characterized by two currents: case management and coordination of Individualized Service Plan (ISP). Its objectives consists in improving autonomy, social integration and quality of life of persons with severe mental disorders, as well as reducing the burden of families and favor a partnership between different resources. From Spring 1992 to January 1996, in Quebec City, 28 people with mental disorder participated in the project. After presenting their profiles, a synthesis of the analysis of 8 history cases allows to put in light the particularities of the model and its functioning.