In most of the developing countries, sustained population growth rates have been a dominant factor in decelerating socio-economic development. The continuing decline in mortality rates has been a major contributor to the acceleration of growth of population in these countries which started in the period following the second World War, and has not abated yet in most of the developing world. There is every likelihood that the population of these developing countries will double in the course of the next generation or so, because of the demographic momentum that is built into their age structure. The rapidly increasing population in low-income countries is not keeping pace with the necessary cultural and technological changes that may help them to raise the standard of living of their masses. Also, high rates of population growth have become a barrier to a successful attainment of the desired socioeconomic development, both quantitative and qualitative.