Iranian Association for Intelligence and Talent Studies International Journal of Education and Cognitive Sciences 3041-8828 6 December 2025 2025 10 01 Effectiveness of Emotion‑Focused Therapy on Psychological Well‑Being, Self‑Efficacy, and Happiness Among Lower Secondary School Female Students in Shiraz Effectiveness of Emotion‑Focused Therapy on Psychological Well‑Being, Self‑Efficacy, and Happiness Among Lower Secondary School Female Students in Shiraz 1 10 EN Journal Article 2025 03 07 <p><strong>Purpose: </strong>This study aimed to examine the effectiveness of emotion-focused therapy (EFT) on psychological well-being, self-efficacy, and happiness among female junior high school students in Shiraz.</p> <p><strong>Methods and Materials: </strong>This quasi-experimental study employed a pretest–posttest control group design with a two-month follow-up. The population consisted of female students aged 13–15 years during the 2024–2025 academic year. Using multi-stage cluster sampling, 46 students were randomly assigned to an experimental group (n = 23) or a control group (n = 23). The experimental group received nine weekly 90-minute sessions of emotion-focused therapy, while the control group received no intervention. Data were collected using the Oxford Happiness Inventory, Ryff’s Psychological Well-Being Scale, and the Morris Self-Efficacy Questionnaire. Data were analyzed using repeated measures ANCOVA in SPSS (Version 28)<strong>.</strong></p> <p><strong>Findings: </strong>The results indicated that emotion-focused therapy had a statistically significant effect on psychological well-being, self-efficacy, and happiness (p &lt; 0.05). Effect sizes showed the largest impact on psychological well-being (η² = 0.640), followed by self-efficacy (η² = 0.554) and happiness (η² = 0.184).</p> <p><strong>Conclusion: </strong>Emotion-focused therapy, when delivered in a group format and adapted to adolescents’ cultural and developmental context, appears to be an effective intervention for enhancing psychological well-being, self-efficacy, and happiness among female junior high school students.</p> https://www.journalecs.com/index.php/ecs/article/download/213/205