In his work, Ivan Illich (1926-2002) makes a radical critique of “institutions” (the Church, schools, hospitals, transport, machines, etc.), alleging that at some stage in their development they become all counterproductive. Can these analyses be transposed to the urban domain? If so, how can they help to make what “shapes” cities intelligible in the age of global urbanisation? This research proposes an Illichian reading of “the business-city” and suggests ways to leave the productivist impasse it is now experiencing. It is structured around two axes : Firstly, in the context of the economic model of scarcity and of the cybernetic model of systems, the City has been replaced by a counterproductive urban business: an anti-city, in which Urbanism becomes iatrogenic. It is « the vast enclosure ». Secondly, Ivan Illich's ideas transposed to the habitable space significantly contribute towards nurturing a new model for leaving industrialism and reconstructing the territory through processes of reduction and reconduction. This is the convivial city
