Dominating the daily news cycle today are the grim realities of grinding poverty, sex trafficking, gender discrimination, child soldiering, HIV/AIDS, failed states, corruption, and environmental breakdown. In the midst of such pain and brokenness, the followers of Christ cannot stand idly by, for God calls them into the mission of reconciling all things, first by easing suffering and then by building flourishing communities through the process of transformational human development. This practical handbook explains what development is, what development workers actually do, and how young people can prepare for mission careers in this field, both in North America and abroad. In addition to setting the big picture for how Christians approach the big questions of international development, the book draws on stories, advice, and wisdom collected from personal interviews with about fifty development professionals.