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Participatory research methods for technology evaluation: A manual for scientists working with farmers is written by Mauricio R. Bellon and published by CIMMYT. It's available with International Standard Book Number or ISBN identification 9706480668 (ISBN 10) and 9789706480668 (ISBN 13).
An introduction to farmer participatory research; An overview of the projects used as examples in this manual; Participation: identifying the places, people, and procedures for research; Diagnosis of farmers conditions; Evaluation of current and new technological options; Assessing the impact of new technologies.