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Meta-analyses indicate the efficacy of positive psychology interventions in promoting well-being. But, despite accumulating empirical and anecdotal evidence of these interventions’ implementation in real-world settings, no review of effectiveness research exists. Accordingly, we identified 40 positive psychology intervention effectiveness trials targeting adults, and scored their reporting using the practice-friendly RE-AIM tool which assesses five dimensions of intervention utility: Reach, Efficacy, Adoption, Implementation and Maintenance. Reporting levels varied substantially: reporting on Reach scored 64%; Efficacy scored 73%; Adoption scored 84%; Implementation scored 58%; and Maintenance scored 16%. Within these five dimensions, reporting on participation rates, methods to select delivery agents, differences between participants and non-participants, programme maintenance and costs, was particularly sparse. The studies involved 10,664 participants, approximately half required specialist delivery, an...