Contributors -- Preface -- 1 Introduction: Farmers, Scientists and Plant Breeding: Knowledge, Practice and the Possibilities for Collaboration -- 2 Understanding Farmers' Knowledge as the Basis for Collaboration with Plant Breeders: Methodological Development and Examples from Ongoing Research in Mexico, Syria, Cuba and Nepal -- 3 Economics Perspectives on Collaborative Plant Breeding for Conservation of Genetic Diversity On Farm -- 4 Social and Agroecological Variability of Seed Production and the Potential Collaborative Breeding of Potatoes in the Andean Countries -- 5 Farmers' Views and Management of Sorghum Diversity in Western Harerghe, Ethiopia: Implications for Collaboration with Formal Breeding -- 6 How Farmer-Scientist Cooperation is Devalued and Revalued: a Philippine Example -- 7 Selecting with Farmers: the Formative Years of Cereal Breeding and Public Seed in Switzerland (1889-1936) -- 8 Theory, Empiricism and Intuition in Professional Plant Breeding -- 9 Conceptual Changes in Cuban Plant Breeding in Response to a National Socio-economic Crisis: the Example of Pumpkins -- 10 Participatory Plant Breeding in Rice in Nepal -- 11 Collaborative Maize Variety Development for Stress-prone Environments in Southern Africa -- 12 Plant Breeding with Farmers Requires Testing the Assumptions of Conventional Plant Breeding: Lessons from the ICARDA Barley Program -- Index.