Systematic Desensitization (S. D.) training, which has been successfully used both individually and in small groups to reduce people's communicative anxiety, must eventually be applied in large training groups to be economical and efficient. In large heterogeneous group work, however, it is important to determine the possible detrimental effects to the less anxious subjects caused by the slow pace of the highly anxious subjects who are training with them. For this study, the hypothesis was tested that homogeneously assigned training groups would achieve a significantly greater reduction of anxiety than heterogeneously assigned training groups, who would, in turn, show a significantly greater reduction of anxiety than a comparable control group. Students enrolled in a basic public speaking course who experienced a high level of communicative anxiety and volunteered for training were assigned either to a homogeneous, heterogenerous, or a control group for work. After 5 hours of Systematic Desensitization training in these groups, tests were given and data were analyzed. Findings did not confirm the hypothesis, however. (Author/JM)