Migration plays a pivotal role in the reallocation of human resources under changing demand and supply conditions. Migration takes place when an individual decides that it is preferable to move rather than to stay and where the difficulties of moving seem to be less than the expected rewards. In recent years there has been a trend of increasing migration rates. The United Nations (2000) estimates that about 140 million persons (roughly 2 per cent of the world’s population) reside in a country where they are not born.1 Usually migration takes place from the regions that are associated with poverty and insecurity towards regions which offer greater security of life, employment and basic social services. Poverty pushes people to migrate to urban areas-the outcome, the world’s urban population approaches 2.3 billion by 1990 with 61 per cent living in the metropolitan areas of developing countries and touches 66 per cent in 2000 (United Nations). Within the world Asia has about 15 of the largest cities of the world and most of them are growing at more than 5 per cent per annum. Increased rate of natural growth, immigration and rural-urban migration might be the causes of such a high rate of growth of urban population.