The first point to note is that the intensive urbanization of the industrial nations which occurred in the past is currently under way in today’s developing countries. Although the rate of urbanization in the developing world is proceeding at a fairly comparable rate as that of the industrial nations in the heyday of their rapid urbanization, the rate of population growth of cities in developing countries as distinct from urbanization is rather unprecedented (Songsore,2003a ;Davis, 1967;Satterthwaite,1996; Preston, 1979). In 2008, for the first time in history, more than half of the world’s population,3.3 billion people, are living in urban areas. This is projected to increase to some 5 billion by 2030 (UNFPA, 2007,p.1;UN-HABITAT, 2008a). ‘’Over 80 per cent of this growth will accrue to Asia and Africa, with most of the rest to Latin America’’(Martine, McGranahan, Montgomery and Fernandez-Castilla, 2008,p.1). Much of this urban population is concentrated in Asia and Latin America which have a good number of mega-cities which are increasingly integrated into functional networks of economic linkages with global or core cities (Rakodi, 1997, p. 52).Between 2000 and 2030 whiles Asia’s urban population of 1.36 billion will about double to 2.64 billion, that of Africa which is far smaller will more than double from 294 to 742 million if the impact of HIV/AIDS can be held in check. At this rate by 2030 seven out of every ten urban inhabitants of the globe will be from Asia and Africa (Martine, McGranahan, Montgomery and Fernandez- Castilla, 2008,p.5).“ By 2050, Asia will host 63 per cent of the global urban population, or 3.3 billion people; Africa will have an urban population of 1.2 billion, or nearly a quarter of the world’s urban population. Altogether, 95 per cent of the world’s urban population growth over the next four decades will be absorbed by cities in developing countries’’(UN-HABITAT, 2008a, p.15).