It has been traditional in demographic research to undertake studies based on cross country regression analyses of crude birth rate (CBR), its correlates, or even marital fertility rates (MFR), on various socioeconomic indicators. The general conclusion to emerge from these studies has been that there exists a relationship between fertility and certain significant socioeconomic correlates. This conclusion does not go much beyond observations based on demographic transition theory or differential fertility studies. These multiple regression studies do not come close to the dynamics and underlying processes that generate the actual observations. It seems that cross country regression analyses of the prevalence of family planning may be more useful for policy purposes. Certain correlates of the level of family planning practice have been identified: foremost among these are per capita income, adult literacy, and the period of family planning advocacy. From a policy standpoint, the literacy of the population seems to be the most amenable to intervention by policy making bodies interested in achieving optimal demographic and socioeconomic conditions within a society.