Slums in cities, the face of the informality of habitat and livelihoods, have lived in the shadow of the formal and legal city for centuries. Individuals seeking cash incomes, or households expelled by disasters from rural areas and a wide spectrum of events in their environment, produce the push to compel individuals and households to migrate to cities. Their logical integration into the formal city fabric, through planned locations for the migrants to stay and work, remains an ongoing challenge and their lives remain cast in illegality and perpetual insecurity.