This study identified, defined, and applied communications concepts required by adult educators in agriculture to fulfill their role as change agents. An extensive review was made of the literature, related research, and opinions of specialists in communication, extension education, and vocational agriculture to predict behavior needed for future competence, identify relevant concepts from the behavioral sciences, and develop educational objectives. Analysis and refining produced 30 distinctive units or concepts. Real-life situations and examples were used to explain such major concepts as affective behavior, channel, commitment, language, message, persuasion, sender, and receiver. Finally, seven kinds of desired knowledge were discussed as guidelines for intensive study: communication as a dynamic process; the importance of communication concepts in educational change; the concepts themselves as related to agricultural education; the importance of the communicator in presenting valid information; sources of difficulties; the sender receiver relationship; and qualities desirable for improving information dissemination. (Three figures and 47 references are included.) (ly)