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The IPTRID Secretariat would like to acknowledge the International Fund for Agricultural Development (IFAD) which funded this project. In particular we would like to thank Mr M. Béavogui, Programme Management Department, Africa I, Director and Mr Sana Jatta, Country Programme Manager who supervised the programme, reviewed several drafts of the document and provided comments. Thanks also are due to Mr Thomas E. Brabben, Principal Scientist, HR Wallingford Ltd, former IPTRID Regional Manager who was responsible for and coordinated the activity. IPTRID would also like to acknowledge the support of the staff who assisted in the finalization of this activity.

The author acknowledges with gratitude the substantial help provided by the participants at the brainstorming session in Rome on 18-19 October 2001, and the many who provided information, contacts and comments on partial draft versions of this report, in particular the following:

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