The number of urban residents in the developing world living in slum conditions was estimated at 863 million in 2012, compared to 650 million in 1990 and 760 million in 2000. Stronger, more focused efforts are needed to improve the lives of the urban poor in cities and metropolises across the developing world. However, in other countries, particularly those affected by conflict, slum prevalence remains very high and the proportion of urban residents living in slums increased from 2000 to 2012.