This study compared the effectiveness of lecture presentations through the use of Educational Telephone Network (ETN) and face-to-face situations of conventional district inservice training meetings for county Extension agents and explored implications for the selection of inservice training media. County staff units were randomly assigned to ETN, face-to-face, and control groups. A post-test instrument consisting of a subject matter knowledge test, an attitude toward the use of ETN scale, and the Rokeach Dogmatism Scale was administered. No significant differences or relationships were found among variables at the .05 level. The means of the 35-item knowledge test scores were 20.62 for the ETN group and 20.31 for the face-to-face group. Both groups possessed significantly more knowledge than the control group which had a mean score of 18.09. The 193 subjects had a mean dogmatism score of 134.24. They indicated a favorable attitude toward the use of ETN. Conclusions include the following: ETN can be an effective medium for communicating cognitive knowledge for Extension inservice training; improvements could be made in the operational procedures used and in the quality of ETN transmissions; and the degree of open-mindedness does not appear to be a significant factor to consider in the selection of ETN for inservice training. (Author/NL)