The purpose of this study was to measure the impact of group counseling on adolescents' intimacy with a close friend. The study population was comprised of 174 residential and day students of seven ninth-grade classes in a residential school in Israel. All participants were socially disadvantaged, with a problematic family background. They were randomly divided into experimental and control conditions: group counseling versus an in-class enrichment program. School personnel in the helping professions conducted all counseling groups after receiving training and supervision. Results of the counseling intervention showed a significant late effect in intimacy growth with a close friend. None of the three covariates (gender, residency, divorce) had a significant impact on results. The results support, to some extent, the dual process model of relationship development.