The present study aimed to determine the effectiveness of life quality-based therapy on happiness, cognitive emotion regulation, and psychological capital among students. This quasi-experimental study utilized a pre-test, post-test, and follow-up design with a control group and a 3-month follow-up period. The research population included all undergraduate psychology students at the Islamic Azad University of Tehran South during the 2024-2025 academic year. A total of 30 participants were selected through purposive sampling and randomly assigned to experimental and control groups (15 participants in each group). The Oxford Happiness Questionnaire (OHQ, 1987), the Cognitive Emotion Regulation Questionnaire (CERQ, Garnefski, 2002), and the Psychological Capital Questionnaire (Lorenz et al., 2016) were used as data collection tools. The participants in the experimental group underwent life quality-based therapy according to the protocol over 8 sessions, while the control group received no intervention. Data were analyzed using mixed analysis with repeated measures. The results indicated significant differences in post-test mean scores of happiness, cognitive emotion regulation, and psychological capital between the experimental and control groups, controlling for the pre-test effect (P < 0.05). It can be concluded that life quality-based therapy is effective in improving happiness, cognitive emotion regulation, and psychological capital among students.
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