important contribution to make in the selection of research problems and priorities, the design and analysis of results, and the screening of recommendations for farmers. Carrying out multi-disciplinary team work in an interdisciplinary manner is not an easy mode of operation for most persons trained in narrow disciplinary fields. It needs to be encouraged and supported. Although on-farm research activities are a logical outgrowth of research institutions, it is also possible to have an extension institution involved in applied or adaptive research. This alternative should not be considered as a shift of the research responsibility from a research to an extension institution. The on-farm program should be related to the research institution for technical orientation and support needed by the extension staff. Close cooperation between research and extension is not common in most developing countries. Often their institutions are budgetarily and physically separated; national extension and research organizations are seldom equal in budget and number of personnel. It is also not uncommon to find a lack of cooperation between these organizations and even personal animosity between researchers and extensionists. All these factors affect the flow of technology transfer from the research program to extension activities. Therefore the alternative to have on-farm research activities within an extension framework is, in principle, one way to establish a rewarding relationship between the two organizations. PLANNING AND MANAGING ON-FARM RESEARCH Any successful research program requires some mechanism for establishing a work plan and for periodically reviewing progress. Advanced planning of on-farm research is particularly important because the work occurs off-station. Consequently, it is important to specify, in advance, what research is to be undertaken and the degree of support to be provided by commodity or disciplinary teams, as they must work in a decentralized manner. The first step in developing a work plan is problem identification. Objectives of the initial characterization and exploratory stages of a regional