 The aim of this cluster randomized trial is to investigate whether the brief, 16 session psychosocial intervention, Interpersonal Counseling IPC is more effective than standard professional treatment ST in the treatment of mild or moderate depression among 12 to 17-year-old adolescents in services provided by school health care and counseling professionals school nurses, school psychologists and school social workers. The clients are identified from the pool of adolescents routinely seen in school health care and counseling services. 