Mapping the evidence base of positive psychology interventions: effectiveness, limitations, and future directions

Positive psychology interventions (PPIs) have emerged as a scientifically grounded body of practice aimed at fostering wellbeing, resilience, and optimal human functioning. Over the past two decades, the empirical literature has expanded substantially, yet critical gaps remain regarding intervention fidelity, population specificity, moderating variables, and long-term efficacy. This systematic review aims to map the evidence base of PPIs by synthesizing findings from meta-analyses, randomized controlled trials (RCTs), and recent empirical studies; identifying effectiveness across diverse populations; delineating methodological limitations; and articulating future research priorities.

A systematic search of PubMed, PsycINFO, Web of Science, and Scopus was conducted using Boolean search strategies. Studies published between 2000 and 2025 were included. PRISMA 2020 guidelines informed the review protocol. Sixty-three primary studies and 11 meta-analyses met inclusion criteria.

PPIs demonstrated consistently positive effects on subjective wellbeing (SWB), life satisfaction, and positive affect (mean d = 0.29-0.47), with moderate reductions in depressive symptoms. Gratitude-based, strength-based, and mindfulness-integrated interventions showed the strongest evidence bases. Technology-mediated PPIs demonstrated emerging efficacy, particularly in promoting engagement, emotional regulation, and intrinsic motivation.

The evidence base for PPIs is substantive but uneven. Future research must address longitudinal effectiveness, cultural adaptation, personalized digital delivery, and integration with clinical practice.