The purpose of this study was to investigate the influence of behavior rehearsal techniques on the behavior of shy children as determined by a measure of verbal behavior. Answers were sought to the following questions:

1. Does participation in a behavior rehearsal program affect the verbal behavior of shy children?
2. Is there a difference between standard and personal hierarchies used in behavior rehearsal?
3. Is there a difference between group and individual behavior rehearsal approaches?

The sample included one hundred seventy-seven elementary school children from nineteen fourth, fifth, and sixth grade classrooms. The subjects were pupils who had a history of low frequency of verbal participation in group and individual settings. Subjects were randomly assigned to one of two principal treatments or a control group. The first treatment was identified as Behavior Rehearsal-Personal. In this treatment subjects developed their own personal anxiety hierarchy. The second principal treatment was identified as Behavior Rehearsal-Standard. In this treatment the subjects were assigned to rehearse items from a hierarchy developed by the experimenter. The two treatments were applied in both one-to-one and group counseling settings. Besides treatment and setting, sex of subject and counselor were used as classification variables and included in a 2^4 factorial analysis of variance design. At the conclusion of a four week treatment period the subjects were observed on the criterion behavior, unsolicited communicative response, during a thirty minute controlled discussion session. Analysis of the data demonstrated that there was no change in verbal behavior as a result of participating in a behavior rehearsal program. It appears that in this study the behavior rehearsal procedures had no differential effect on the verbal behavior of the shy children. No significant difference was found on any of the other factors which· were measured. Neither the treatment setting, nor the sex of the subject, nor the counselor appeared to have a significant effect on the final results of the study. Although research studies indicate that the behavior rehearsal technique should be an effective technique for shaping assertive behaviors, no such evidence was found in this study. Nor was support found for the traditional view that personalized hierarchies are more effective than standard hierarchies. The lack of research on the behavior rehearsal technique suggests that more intensive and systematic research is needed to assess the specific effects behavior rehearsal has on the behavior of shy children.