Pursuing usableness and effectiveness in the development of a shared patient centered information system.

Our experience supplying a shared patient centred information system is here described, pointing out some of the critical aspects underlying usableness and effectiveness. Between and within unit integration, together with providing each professional role with added value and the special attention to adjust input and information retrieval to the actual needs (often identified only by an assiduous frequentation), has proved to be the essential point. A study case is presented.