Research on farming systems has developed in the last decade and is being pursued in Africa, Asia, and Latin America at regional, national, and international institutions. Among the international research institutions involved in farming systems research are the International Rice Research Institute (IRRI) in the Philippines; the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) in India; the International Institute of Tropical Agriculture (IITA) in Nigeria; and Centro International de Agricultural Tropical (CIAT) at Colombia. According to Norman (1980), the farming system approach adopted by these institutions consisted of two basic types-the UPSTREAM and DOWNSTREAM approaches-which were recommended by the Technical Advisory Committee (TAC) in 1978 (Norman, 1980). The upstream approach utilizes research from experiment stations to find prototype solutions to the major constraints on agricultural improvement in a relatively large area. The downstream approach is basically a farm level approach in which farmers and a multidisciplinary research team work together to diagnose, design, modify, and improve farming systems in a given area. The latter approach uses information from the former (experiment station and commodity research programs) to design improvement in a particular farming system at the completion of analyzing the major constraints (Norman, 1980). Stressing the need for FSR&D, Harwood (1982a) stated that FSR applies to both agriculture in both developed as well as developing nations. He argued that many resource-efficient technologies are concerned with the complementarity and integration of enterprises on a farm for efficient