First, let us consider the pertinence of an approach through social sciences – critical sciences of social practices – to understand a document of town planning, i.e. in this case the cantonal master plan (Plan Directeur Cantonal, PDCn). Let us then use this master plan as a discursive object. An object, whose principle is to give voice to space and its resources, to city-makers, inhabitants, etc. More precisely, an object which structures a wider discourse (of producers, State agents, experts…) as well as multiple and decentralised threads of discourse (of consumers, citizens, inhabitants…) [read].