This research project conducted in France analyzes the role of information practices in sustainable management. Facing an important social issue, can a professional community succeed in self-managing a sustainable and consistent information system, resisting the evolution of economic, technical and social environments, despite the lack of external organization or mediation? To try to answer this question, we chose a research methodology based on three approaches: sociological, semio-pragmatic, and documentary. Our analysis revealed three information systems : oriented toward the actor, oriented toward the organization, and oriented toward the activity. An in-depth analysis allowed us to conclude that activity and networks shape interactions and formats ensuring information sustainability.