People who live in rapidly developing urban areas of the Third World need housing. And housing needs the supporting infrastructure of water supply, sanitation, drainage, access, power supply and solid waste removal. The most recent figures for "low income" and "middle income" countries report an urban population of 1439 million. Of these 432 million are living in informal housing without adequate services. This figure is likely to double over the next 20 years. This book describes alternative and inexpensive technologies which householders should be able to implement and maintain. It shows how health, security and access objectives can be met in unconventional ways and suggests methods for involving low-income communities in development and management. The book also reports on research that demonstrates the interaction between services on high density sites. Particular attention is paid to the key elements of drainage and sanitation.