This book contains 21 chapters presenting the most comprehensive, accurate and informative view of the spread of improved crop cultivars in Africa south of Sahara. The importance of the diffusion and adoption of different crop cultivars and the impacts of the use of these improved cultivars are also discussed.

Includes bibliographical references and index.

The Importance of Generating and Documenting Varietal Change in Sub-Saharan Africa / T.S. Walker and J. Alwang -- Investments in and Impacts of Crop Improvement Research in Africa / J. Alwang -- Relevant Concepts and Hypotheses in Assessing the Performance of Food Crop Improvement in Sub-Saharan Africa / T.S. Walker -- Coverage, Data and Methods in Assessing the Performance of Food Crop Improvement in Sub-Saharan Africa / T.S. Walker -- Genetic Improvement of the Crops in the 1998 Initiative : Historical Context and Exploratory Analysis / T.S. Walker -- The Effectiveness of Crop Improvement Programmes from the Perspectives of Varietal Output and Adoption : Cassava, Cowpea, Soybean and Yam in Sub-Saharan Arica and Maize in West and Central Africa / A.D. Alene, T. Abdoulaye, J. Rusike, V. Manyong and T.S. Walker -- Assessing the Effectiveness of Agricultural R&D for Groundnut, Pearl Millet, Pigeonpea and Sorghum in West and Central Africa and East and Southern Africa / J. Ndjeunga, K. Mausch and F. Simtowe -- The Performance of Bean Improvement Programmes in Sub-Saharan Africa from the Perspectives of Varietal Output and Adoption / R.A. Muthoni and R. Andrade -- The Effectiveness of Potato and Sweetpotato Improvement Programmes from the Perspectives of Varietal Output and Adoption in Sub-Saharan Africa / R. Labarta -- Evaluating the Key Aspects of the Performance of Genetic Improvement in Priority Food Crops and Countries in Sub-Saharan Africa : The Case of Rice / A. Diagne, F.M. Kinkingninhoun-Medagbe, E. Amovin-Assagba, T. Nakelse, K. Sanni and A. Toure -- Assessing the Effectiveness of Maize and Wheat Improvement from the Perspectives of Varietal Output and Adoption in East and Southern Africa / H. De Groote, Z. Gitonga, S. Mugo and T.S. Walker -- Varietal Output and Adoption in Barley, Chickpea, Faba Bean, Field Pea and Lentil in Ethiopia, Eritrea and Sudan / Y.A. Yigezu, C. Yirga and A. Aw-Hassan -- Scientific Strength in Rice Improvement Programmes, Varietal Outputs and Adoption of Improved Varieties in South Asia / S. Pandey, Ma. L. Velasco and T.S. Yamano -- Analysing Scientific Strength and Varietal Generation, Adoption and Turnover in Peninsular India : The Case of Sorghum, Pearl Millet, Chickpea, Pigeonpea and Groundnut / D. Kumara Charyulu, M.C.S. Bantilan, A. Raja Laxmi and D. Shyam Moses -- Maize Technologies and Rural Poverty Reduction in Ethiopia / D. Zeng, J. Alwang, G.W. Norton, B. Shiferaw, M. Jaleta and C. Yirga -- Impacts of Improved Bean Varieties on Poverty and Food Security in Uganda and Rwanda / C. Larochelle, J. Alwang, G.W. Norton, E. Katungi and R.A. Labarta -- The Diffusion and Impact of Improved Food Crop Varieties in Sub-Saharan Africa / K. Fuglie and J. Marder -- Varietal Generation and Output / T.S. Walker, A. Alene, J. Ndjuenga, R. Labarta, Y. Yigezu, A. Diagne, R. Andrade, R. Muthoni Andriatsitohaina, H. De Groote, K. Mausch, C. Yirga, F. Simtowe, E. Katungi, W. Jogo, M. Jaleta, S. Pandey and D. Kumara Charyulu -- Varietal Adoption, Outcomes and Impact / T.S. Walker, J. Alwang, A. Alene, J. Ndjuenga, R. Labarta, Y. Yigezu, A. Diagne, R. Andrade, R. Muthoni Andriatsitohaina, H. De Groote, K. Mausch, C. Yirga, F. Simtowe, E. Katungi, W. Jogo, M. Jaleta, S. Pandey and D. Kumara Charyulu -- Validating Adoption Estimates Generated by Expert Opinion and Assessing the Reliability of Adoption Estimates with Different Methods / T.S. Walker -- Implications for Monitoring Progress and Assessing Impacts / J. Alwang.

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