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Section I: Priority setting and research evaluation Processes and methods for research programme priority setting: The experience of the Kenya Agricultural Research Institute Wheat Programme ....... 3 B.F. Mills and D.D. Karanja Geographic information systems applications to research evaluation: The example of maize from Kenya ...................................... 22 R. Hassan, J. Lynam and J. Corbett Section II: Institutional issues Use of comparative studies as a mechanism for institutional change ................ 39 K.C. Nelson Rural institutions and choice: Alternative approaches to resource access and allocation for technology adoption in African agriculture .................. 59 E.L. Crowley Sustainable agricultural development and adoption of improved farm practices: The case of institutional constraints....................................... 78 Zegeye Hailu Section III: Commodity policies and food security The changing role of sweet potato in South Nyanza, Kenya ........................ 95 J.W. Low Economic analysis of mixed grazing by sheep and goats in a semi-arid environment .... 119 T.O. Williams and S. Fernandez-Rivera Impact of modern wheat technology in Upper Egypt: Analysis of financial and economic returns ........ ............................. ..... ...126 A.A. Aw-Hassan Introducing winter sown chickpea: The cases of Morocco and Syria .............. 143 R.N. Tutwiler Household food security through home gardening: Evidence from Bangladesh ...... 158 R.R. Marsh Section IV: Natural resource management and biodiversity Is systems research the way forward for African agricultural research? .............. 175 J.K. Lynam Changing uses of wealth stores by rural smallholders: Description of an approach used for longitudinal analysis of livestock transactions in the Sahel ............. 19: M.D. Turner Environment and government policies in northern Nigeria ..................... 205 H.A. Freeman Deforestation for pastures in Central America: The last fifteen years ............... 223 D. Kaimowitz Plot and household histories: A method to study land management change ......... 239 G. Bergeron and J. Pender Section V: Technology evaluation, adoption and transfer Using contingent valuation to assess the prospects for local participation in public good provision: The case of trypanosomiasis control in Ethiopia ......... 263 B.M. Swallow Splitting targets and hitting hairs: Anthropological perspectives on fish culture technology transfer through non-governmental organisations (NGOs) in Bangladesh ......................................... ............. 281 E. Worby Evolution of livestock production systems in semi-arid West Africa: Evidence from Niger .............. ............................... . .296 B.I. Shapiro and J.H. Sanders Improving livestock research and technology transfer in developing countries ....... 312 S.K. Ehui and B.I. Shapiro Listofparticipants .................................... .............329