A direct observation of absence of public space in areas of illegal genesis in Metropolitan Area of Lisbon, shaped the PhD research question: How public space make UAIGs� (re) living to (re) integrate it in Lisbon Metropolitan Area dynamics? The methodology is based on methods and tools that allow: 1| Mapping the network of UAIG in the Lisbon Metropolitan Area, to have an overall picture of the situation; 2| Morphological, social and typological analyses of the UAIGs local informal public space; 3| Promoting micro participatory practices, community design, to transform public space and stimulates a sense of belonging.