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To determine the efficiency of voice communications systems aboard Naval vessels, recordings of messages transmitted during actual Naval operations were analyzed. The frequency of occurrence of various types of messages was tallied and the relative contribution of each message in terms of the information transmitted was determined. Analysis of complete and representative transcriptions aboard Naval vessels indicated that approximately 30 percent of the total number of messages in the sample contain information which does not contribute to the efficiency of Naval operations. Probably more important is the fact that these messages are actually interfering with communications by making the channels unavailable for essential messages. The results of the present study suggest that marked increases in the efficiency of voice communications may be obtained from the following: (1) More extensive training in current voice communications techniques prior to individual assignment. Particular emphasis should be placed upon the critical importance of circuit discipline. (2) More intensive training for those whose billet will involve voice communications duties. (3) Frequent monitoring of communications circuits as a technique for evaluating current communications practices.