One of the biggest issue of our time is the poor housing conditions of about the 50% of the urban population, forced to live in conditions of informality.
This condition is often considered as situation of poverty, poor sanitation, auto construction and auto exclusion by all the services that a city should provide.
This people are intellectually and socially excluded from the population and the city itself.
On the global scale this issue is caused by the continuous growth of the population since the 1970s.
Leading to a greater demand for services, to which, the now endless city world- wide, fails to respond, creating new mechanisms, antagonists for the society, for the appropriation of the urbanity.
The informal urbanism that now represents half of the world’s urban fabric has become the most spontaneous and ordinary way of doing architecture, mixing with the formalized existing urban fabric.
This creates an amorphous growing of the city and a new policy in contrast with those already present.
In most of the world cities the spaces informal architecture takes place are blank spaces that are often on the edge of towns and even not represented on maps, creating more exclusion and separation from what is the urban life of the city.
In an Italian reality as Milan many don’t know that this problem is present and that it is growing.
In Milan are present, according to a census of 2012, 22 sites of foreign populations and not living for the 63.6% in informality.

Now in Milan with Expo 2015 it also seems clear who is constructing but not for who, loosing the perspective of which are the problems of the city.