This thesis discusses the relationship between the dynamics of social transformation of communities of experience and the dynamics of subjectivation in the course of militant, civic or urban action, of actors emerging in different circumstances, and who try to influence their context of action.How the action of the actor engaged in a process of subjectivation to the encounter of the other makes return to his world or environment, and also to that of the other? Everything here is about borders and limits, history and memory in action. This thesis explore the work of the “les gens du bord”, passers of bright memory, passers of material and symbolic borders, throught various field materials and situations.Three types of experience with high so...