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An approach is described for identifying the communication networks which exist in agricultural systems, and for assessing their performance in order to recognise and remedy bottlenecks in the system. The paper draws on fieldwork conducted in the Philippines, Peru, and Ethiopia. The approach brings together researchers, field workers and rural communities to identify jointly the networks of information exchange. The process includes mapping of actors and linkages; analysis of linkage performance; and developing an action plan to modify roles and improve linkages.