From a sample of sixteen buildings selected throughout the region of Provence-Alpes-Côte d'Azur, this research has the objective to explore two kind of questions : firstly, the social construction of the Post-war economic booms heritage ; secondly, about architectural postures of the transformation of the modern project. "Social construction of heritage" means a device in wich a plurality of actors develops concerted or more isloated actions. These are the practices of the conservation institution of historical monuments, that is to say a control and architectural consulting conducted by organizations such as the ABF and the CAUE. But we must also take into consideration all forms of interference in the operational environment of teaching a...