The effects of behavior rehearsal and audiotaped vignettes as added components to a 12-session assertion training lecture series were studied. Subjects were 96 third-grade children of average or above average IQ. Results showed that on both measures of assertion, behavior rehearsal was a significant adjunct to the assertion lecture, which was also given to the attention control children. On one measure of assertion an effect was also noted for the audiotaped observation condition. There was no effect of IQ. While clear increases in assertion were found, no effect on neuroticism or trait anxiety was noted. It was recommended that school mental health programs include an assertiveness segment in their curriculum.