The Welfare State, and especially its health care systems, is in crisis in all developed countries. Answers were sought in the new uses of information and communication. In France, with the specific issue of compartmentalization, the new interface organizations are new areas of innovation and cooperation between primary care and hospital sector. The dilemma traceability/data security inspired solutions to the problems of the organization of the patient’s pathway. Using the notion of situation, we then consider new information practices for an approach of "sustainable" information promoting interactions and cooperation. We will show the evolution of cooperation from coordination through procedures to new integrated services for the patient. A new culture of information can become a lever of organizational intelligence and continuous improvement for all stakeholders, including patients, when all participate actively, trust one another and use the tools developed.