Security of land tenure for the urban poor is now a major problem for developing cities in Africa, Asia and Latin America. This book presents and analyzes the main conclusions of a comparative research programme on land tenure issues. It looks at how solutions can be found and implemented to respond to the demands and needs of the majority of squatters and informal settlements, and analyzes how urban stakeholders, with different social, legal and economic constraints, find innovative and flexible solutions. The book is intended to fill a gap in the literature on comparative research on tenure.