Adolescents with the best academic, social, and physical health outcomes have both low psychopathology andelevated subjective well-being (SWB). Psychological research and practice have focused on pathology. There are few interventions available to improve SWB. This project will evaluate the efficacy, fidelity, feasibility, acceptability of implementation and training, and cost-effectiveness of the Well-Being Promotion Program. This program is an innovative Tier-2 intervention for use by school mental health teams that is integrated within a multi-tiered system of support for student mental health to increase student SWB. Researchers expect students who take part in this positive psychology intervention will experience lasting gains in SWB in addition to the prevention/reduction of psychopathology and greater academic success.