The huge urbanisation process which has been taking place in developing countries, which brought to half of the world population living in urban areas, imposes a total revision of consolidated town planning models and approaches, as it does in developed countries the immigration of people coming from developing or in any case poorer countries. This is the real challenge to be addressed in terms of adaptation, renovation or even total transformation of urban areas, to accommodate new comers, to prevent social marginalisation and conflicts, to develop the dynamic concept of inclusion and to develop the new opportunities that migratory processes disclose rather than to build unlikely fences.