The article outlines a proposal for a framework of evaluation as part of a project for the prevention of tobacco addiction. Though not glaringly self-evident, this type of evaluation is a response to a pressing need in view of the wide range of partners involved, the available conventions and different temporalities among actors. The conceptual and methodological approach draws from the sociology of organizations and political science, but also from the perceptions and experiences of a wide range of actors. Far from being exclusive, the concepts and analytical tools used to assess the project may yet serve to restore the fundamental meaning of a system of relations within a project or, better yet, to direct emerging projects on the basis of future relations anticipated between the different partners.