This paper explores four aspects of the cultural negotiating process involved in the practice of streetwork. The negotiation of the social mission of streetwork is first illustrated. Then, a description of the cultural negotiating process linked to the immersion of the streetworkers in the street world is done. A third part tackle the strategies used by those practionners to root their interventions in a world of sens built with people. Finally, a last part shows how the streetwork create opportunities between marginal and institutional cultural scene. The strength of a cultural framework as analytic tool of intervention is demonstrated in conclusion.