Abstract Using a cross-sectional cohort design, this study examined the effects of a psychosocial program for Palestinian adolescents across 4 years post implementation. A questionnaire was developed for the assessment of psychosocial well-being in West Bank schoolchildren. Results supported the hypothesis that children who participated in the intervention would exhibit higher questionnaire scores than control children. However, results did not support the hypothesis that psychosocial well-being would be lower in children for whom more time had passed since the intervention. Possible interpretations for these findings are presented, including the possible confounding effects of external sociopolitical variables such as teachers' strikes and civil infighting.