In many countries strategies for encouraging assimilation and integration within cities are under way to counteract social, economic, and spatial polarization. Access to basic infrastructure, security of tenure, and urban design play a vital role in these approaches. The book brings together expertise from developing countries, North America, and Europe. Peter Herrle is professor of architecture and urban development at Berlin University of Technology. Uwe-Jens Walther is professor of urban and regional sociology at the Institute of Sociology at Berlin University of Technology.