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註釋The paper opens with brief examinations of the process of agricultural extension, and the different forms of publicly provided extension services. An extensive review of the common ways of organizing extension emphasizes the similarities and differences between, and strengths and weaknesses of, rural extension, commodity based extension and extension services founded in Universities. The World Bank is shown to have supported all types of extension. The scale of that support and the Bank's role and aims in providing it are examined at some length. The achievements of other donors are similarly examined. Several important aspects of extension are identified which require careful treatment in designing or modifying extension systems. The importance of a stable agricultural policy environment is emphasized along with the need for a robust yet flexible research system. Further drawing on work done by the World Bank and elsewhere, some important economic issues in developing, implementing, monitoring and evaluating extension projects are reviewed. The paper closes by drawing a series of conclusions relevent to the formulation of agricultural extension policy and notes some areas where further study and analysis are needed.