21 Chambers, R., A. Pacey, and L. A. Thrupp. 1989. Farmer first: Farmer innovation and agricultural research. Intermediate Technol. Publ., London. Cox, D.R. 1958. The Planning of experiments. Wiley, New York. Deming, W.E. 1953. "On the distinction between enumerative and analytic surveys." Journal of the American Statistical Association, 48: 244-255. Deming, W.E. 1975. "On probability as a basis for action." American Statistician, 29: 131-137. Doing, S. M., and C. A. Francis. 1990. Efficiency of one-replicate yield testing. J. Prod. Agric. 33):399-402 :berhart, S.A., and W.A. Russell. 1966. Stability parameters for comparing varieties. Crop Sci. 6:36-40. Finlay, K.W., and G.N. Wilkinson. 1963. The analysis of adaptation in a plant breeding programme. Aust. J. Agric. Res. 14:742-754. Francis, C. A. 1986a. Designs for reseearch: the quest for credibility. Seminar, MTDI Workshop on Small Farm Enterprises, Ames, Iowa, May 12. Francis, C. A., editor. 1986b. Multiple cropping systems. Macmillan Publ. Co., New York. Francis; C. A., J. King, J. DeWitt,-J. Bushnell, and L. Lucas. .1990. Participatory strategies for information exchange. Amer. J. Alternative Agr. 5:000-000 (in press) Francis, C. A., and J. D. Doll. 1991. Participatory research and extension strategies for sustainable agricultural systems. Weed Science (submitted). Franzluebbers, A. 1991. On-farm results of fertilizer response in crop rotations. M.S. Thesis, Univ. of Nebraska, Lincoln. Freeman, G.H. 1973. "Statistical methods for the analysis of genotype-environment interaction." Heredity, 31: 339-354. Gilbert, E. H., D. W. Norman, and F. E. Winch. 1980. Farming systems research: a critical appraisal. MSU Rural Devel. Paper No. 6, Dept. Agr. Econ., Michigan State Univ., East Lansing, Michigan. Harrington, L.W. and R. Tripp. 1984. Recommendation domains: A framework for on-farm research. CIMMYT Economics Program Working Paper 02/84. CIMMYT, Mexico. Harville, D.A. 1976. "Extension of the Gauss-Markov theorem to include the estimation of random effects." Annals of Statistics, 4: 384-395. Henderson, C.R. 1975. "Best linear unbiased prediction under a selection model." Biometrics, 31: 423-447. Hildebrand, P.E. 1981. Combining disciplines in rapid appraisal: The sondeo approach. Agricultural Administration. 8:423-432.