Abstract
Local knowledge (both technological and sociological) and communication systems represent a logical starting point and a rich body of resources for successful agricultural research, development, and extension (RD&E). Drawing upon concrete examples from Asia, Africa, and Latin America, this essay presents an overview of definitions, topics, and applications of local knowledge in agricultural RD&E. Also noted are caveats, future research and training needs, and human values issues related to the study and utilization of local knowledge systems and their products