Dairy farmers (N=387) in two Pennsylvania counties were studied concerning their adoption of practices used on nearby demonstration farms. A total of 37 variables (including 11 "dummy variables") were used to measure personal characteristics, economic structures of farms, communication sources, and formal and informal participation. Factor analysis and multiple regression analysis were performed. Seven of the 37 variables accounted for 46% of the variance in adoption. Five of the seven variables (acreage farmed, farm equipment, participation in agricultural extension programs, participation in economic organizations, number of top twenty farmers talked to) were measures of formal participation, economic structure of farms, and communication sources. The farm equipment index explained over 20% of variance in adoption, which indicates that some processes are more applicable to larger, highly mechanized farms. None of the static personality characteristics was significant. (The document includes four tables, 48 references, and a brief research review.) (ly)