The driving forces of income growth, demographic shifts, globalization and technical change have led to a reorganization of food systems from farm to plate. The characteristics of supply chains - particularly the role of supermarkets - linking farmers have changed, from consumption and retail to wholesale, processing, procurement and production. This has had a dramatic effect on smallholder farmers, particularly in developing countries. This book presents a comprehensive framework for assessing the impacts of changing agri-food systems on smallholder farmers, recognizing the importance of heterogeneity between developing countries as well as within them. The book includes a number of case studies from Asia, Africa, Latin America and Eastern Europe, which are used to illustrate differences in food systems' characteristics and trends. The country case studies explore impacts on the small farm sector across different countries, local contexts and farm types.