Using 74 adult farmers in four matched groups in Central India, this study examined the impact of group radio listening, discussion, decision, commitment, and consensus on the effectiveness of Indian radio forums. Effectiveness was measured in terms of changes in knowledge, belief, attitudes, and intention to adopt an innovation. Subjects were divided into two groups after listening to a recorded 25 minute radio program on new methods of storing food grains. About half the listeners from each village were assigned to group discussion. Treatments involving decision making and commitment were then given through oral instructions. These were among the major findings: (1) group radio listening plus group discussion were more influential than group listening alone; (2) group discussion and group decision making was more influential than group discussion plus group listening; (3) public commitment was more influential in the listening plus discussion group than in the listening group without discussion; (4) the usefulness of private commitment and of group consensus was not shown. (Author/LY)