A controlled evaluation of assertion training with adolescents.

A controlled evaluation of an assertion training package for adolescent students is described. Adolescents who received the treatment were compared to adolescents who received a placebo-counseling program. Although there were no significant differences between the groups prior to the program, the students who received the assertion training treatment significantly improved their ratings on the Piers-Harris Children's Self-Concept Scale both at termination and at a one-month follow-up. No effects were found on a locus of control scale or an anxiety scale for either program.