Abstract
Building on its reputation around the world, the housing first policy in France continues to produce effective results. It thus becomes a social norm in the fight against exclusion. At its heart, the rental intermediation system (IML) works for the development of the capacity to live and the maintenance in the habitat of supported people. However, the implementation of this device is not without difficulty. This article tends to highlight the promises and ethical fragilities of Housing First as a social norm. It shows that the challenge is not only to adapt to the intensity of the vulnerabilities, but also to secure the device itself by feeding its elasticity to allow it not to lose its shape and its qualitative and quantitative perspectives.