Part I Basic Classifications Two basic classifications structure this report. First, we classify the cutting edges for growth in agriculture's capacity to produce into four categories: science and technological advance, improved institutions, human skills, and an expanded and improved capital base. Secondly, we classify agricultural research into three categories long a continuum running from problem-solving to basic or disciplinary research. The three categories are problem-solving (PS), subject-matter (SM) and disciplinary (DISC) or basic research. These two classifications provide a perspective on the substance of research done in the agricultural research establish- ment (ARE), and the role and responsibilities of the ARE and associated public and private agencies in doing PS, SM and DISC research. These perspectives, in turn, help us to understand what is needed to get the necessary research done for the next 50 years. The Four Cutting Edges for Growth in Agriculture's Capacity to Produce Growth in agriculture's productive capacity results from progress made on four fronts or cutting edges: technological advance, improved institutions, human skills, and an improved and expanded capital (physical and biological) base. All are essential-none is in- dividually sufficient. The challenge is to obtain an appropriate combination of them. Technological advance is crucial and necessary, but alone it is not sufficient for agricultural progress. One agricultural system after another around the world has failed to take advantage of modern technology because of adverse policies and institutions that hampered use of available technologies. Further, as agricultural systems advance technologically, they become increas- ingly dependent upon highly trained people and effec- tively operating public research and control facilities. It is the highly trained people of an agricultural system who generate both technological advances and the in- stitutional innovations conducive to the proper ex- ploitation of technological advances. Also, complex technologies, institutional controls and forms and, in recent years, the computerization of agricultural pro- duction, marketing, processing and food distribution all require skilled managers. Improvements in human beings have become more fundamental and primary as our agricultural systems have developed. Further, we must not forget the importance of accumulating biological/physical capital. The lands of Holland, for instance, are now productive because much capital was invested in soils that were originally poor or inaccessible. The Dutch added drainage systems, dikes, canals, plant nutrients, organic matter, buildings, service roads, fences and a vast amount of social infrastructure to convert poor inaccessible soil in- to an excellent land base for one of the most productive agricultural systems of the world. Capital is being in- vested in soil to create more productive land in the United States, also, and the saturation point for such investments is far in the future. Agricultural systems increase in productivity because of investments of capital in orchards, vineyards, breeding herds, research stations, input supply industries, processing plants and marketing facilities. Capital accumulation,