The schools of architecture of four Spanish and Italian universities organized and Florence an international workshop of projects on the social housing, to developing in the own city toscana. The mixed format of the workshop promoted a series of reflections on the question of the social contemporary housing from diverse theoretical approaches, in parallel to the analytical work of the proposed place and the development proyectual of the concrete program. This publication gathers the summaries of the given conferences and the projects that the groups of pupils realized.