This study examined the use of problem-based learning (PBL) in an actual counseling session and the effects on student assertiveness skills. A group of seventh-grade students, who were all victims of bullies, participated in the study. The students, two boys and one girls, were 13 and 14 years old. Teachers rated the level of assertiveness skills that students exhibited when confronted by other students. After the establishment of baseline skills, group counseling sessions were conducted twice a week for 3 weeks according to an adapted PBL model. Students identified a common problem they wanted to resolve. They then made a list of facts and asked open-ended questions concerning the problem. They held a discussion about each question, formed hypotheses, identified counseling issues, and listed resources. Student assertiveness skills were measured after the intervention, and findings indicate that treatment using the PBL methodology was effective in increasing assertiveness skills. An appendix contains the assertiveness rating scale. (SLD)