The Challenge of Slums presents the first global assessment of slums, emphasizing their problems and prospects. It presents estimates of the numbers of urban slum dwellers and examines the factors that underlie the formation of slums, as well as their social, spatial and economic characteristics and dynamics. It also evaluates the principal policy responses to the slum challenge of the last few decades. The report argues that the number of slum dwellers is growing and will continue to increase…

The current paper presents the results of a first global enumeration of slums at the country level. The data are analyzed and comparisons established at sub-regional and regional levels while trying to understand what is happening globally. This document is the culmination of attempts to come to grips with changes in the way we measure slums, starting by providing an agreed universal definition of this type of settlements and a clear methodological approach. The preliminary estimations…

Includes a brief overview of what slums are and why the continue to exist.