The exchange of information between patients on diseases and practitioners is a condition for the regulation of the care market through the sanction of good or bad reputation. This chapter builds a series of assumptions on processes (a) that allow for discussions on health and carers; (b) which allow certain relations, and not others, to include such discussions; (c) which, depending on localities and social backgrounds, form different networks which can more or less form a judgment; (D) which lead the opinion of an actor to be formed by its confrontation with partners who may have a variety of views. Finally, imaginary examples of voting show how they can evolve differently depending on the types of interpersonal confrontation in which preferences are initially expressed.