Agroforestry science is very young, and there are few teaching materials at higher levels of learning. This book fills the void with general principles/tenets on all aspects of agroforetry for the agroforestry curriculum. Topics include components, forms, niches, and history of agroforestry; lessons from research and focus of agroforestry in the future; efficiency in use of biophysical resources; products and services from agroforestry; complexity and sustainability of agroforestry; tree-crop interactions; economics of agroforestry; tree management in agroforestry systems; socio-economic issues that limit tree planting and adoption of agroforestry; guidelines and strategies of scaling-up adoption and impact of agroforestry. The book is suitable for students of agriculture and forestry, professionals and policy makers in land use and environmental protection.