This book evaluates the evidence on the impacts of population growth on well-being in developing countries and concludes that slowing population growth from high current levels, especially in poor, agrarian societies facing pressure on land and resources, is advantageous to economic development, health, food availablitiy, housing, poverty, the environment, and possibly education. It also concludes that while other economic and social policies may affect one or a few of these components of well-being more directly, few, if any, are likely to have the breadth of impact of family planning programmes.