The international debate on biodiversity has resulted in a renewed interest in the role of farmers and local communities in the management of natural resources and crop genetic diversity. The local varieties of crops which have been developed by farmers have made a great contribution to plant breeding genetic resources in the North. In recent years it has become apparent that local crop diversity in the South is threatened by promotion of modern varieties promising higher yields. This study reflects new approaches and concepts in the field of conservation and the development of local crops. Case studies from Africa, Latin America and Asia address these issues from different angles, examining the significance of local knowledge, and documenting new approaches and methodologies. The text looks at the policy issues raised by the expansion of agribusiness, and the need to consider the interests of small-scale farmers. The authors come from a variety of backgrounds, from plant breeders to anthropologists, international researchers to NGO development workers and lobbyists, and present a number of different views and perspectives on the subject. This text should be of interest to researchers from biological and social backgrounds, as well as people with a more practical interest. The book provides an introduction to this field, and should be of use to university teachers and students in the agricultural, biological and social sciences. It places farmers at the centre of crop development and genetic diversity, and through this focus, challenges the dominant models in formal crop research.