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Population projections are based on assumptions about future changes in fertility, mortality and migration. This book describes methods that can be used for making these assumptions. The book shows how international comparisons can be helpful in making population projections. For international migration international comparisons can contribute to improve estimates of the size and direction of immigration and emigration flows. For projecting fertility international comparisons can show in what direction the future level of fertility may move. Projections of mortality can be based on the estimation of an average trend in life expectancy over a group of countries.