This Probabilistic Population Projections CD-Rom was prepared by the Population Division of the United Nations Department of Economic and Social Affairs (DESA). It contains probabilistic projections of total fertility, and also includes probabilistic projections of life expectancy at birth for all countries that do not have a high prevalence of HIV/AIDS infections. The probabilistic projections are based on the historical estimates of population by age and sex, fertility and mortality between 1950 and 2010 from the 2010 Revision of the World Population Prospects.