In a mega-city such as Lagos, Nigeria, planners are trying to redevelop neighbourhoods and create more cohesive, manageable and livable communities. Nations like Ethiopia and India have launched campaigns to end child marriages and prevent life-threatening adolescent pregnancies. With good planning and thoughtful policies. When young people can claim their rights to health, education and decent working conditions, they become a powerful force for economic development and positive change. Throughout the developing world, social scientists and policymakers want to make the most of large youthful populations, for the sake of hopeful young people themselves as well as in the interests of economic growth and development.