Shahid Beheshti University Applied Psychology 2008-4331 Articles in Press 2024 07 06 Validity and Reliability of the Persian Form of the Substance Use Motives Measure Validity and Reliability of the Persian Form of the Substance Use Motives Measure 104638 10.48308/apsy.2024.235198.1633 FA Saeedeh Sadat Mostafavi Ph.D. Student in Clinical Psychology, Department of Psychology, Faculty of Educational Sciences and Psychology, Shahid Beheshti University, Tehran, Iran. Shahriar Shahidi Faculty of Psychology and Educational Sciences Shahid Beheshti University Saeed Imani Assistant Professor, Department of Counseling, Faculty of Educational Sciences and Psychology, Shahid Beheshti University, Tehran,Iran. Alireza Norozi Assistant Professor of Psychiatry, National Center for Addiction Studies, Tehran University of Medical Sciences. Tehran. Iran. Pegah Nejat Faculty of Psychology and Educational Sciences Shahid Beheshti University Journal Article 2024 03 31 A review of empirical evidence shows that substance use behavior in Adolescents results from different motives such as socializing with friends or escaping negative mood. <strong>Aim:</strong> this research was conducted with the aim of psychometric analysis of the comprehensive version of the Substance Use Motives Measure (SUMM) in adolescents. <strong>Methods:</strong> In this descriptive survey research, from the statistical population of the second high school boys in the 11th district of Tehran in the academic year 1402-1403, a number of 402 adolescents (mean age: 16.93) were selected using the convenience sampling method, responded to the SUMM, and Self-Efficacy-Short Version (SE-SV, Muris, 2001) and the Multidimensional Scale of Perceived Social Support (MSPSS, Zimet, Dahlem, Zimet & Farley, 1988). <strong>Results:</strong> The results of the confirmatory factor analysis showed that the SUMM had good factorial validity with an eight-factor structure consisting of enhancement, social, conformity, anxiety-coping, depression-coping, boredom-coping, self-expansion & performance motives. In addition, the results related to the correlation between the multiple dimensions of the comprehensive model of substance use motives with self-efficacy beliefs and perceived social support defended the criterion validity of the SUMM. Besides, the Cronbach's alpha result showed that the subscales of the SUMM were internally consistent. <strong>Conclusion:</strong> the results of this research, while defending the sound of the theoretical foundation of the comprehensive model of the substance use motives measure in adolescents, showed that the SUMM to understand the reasons for their use of different substances is technically valid and reliable. A review of empirical evidence shows that substance use behavior in Adolescents results from different motives such as socializing with friends or escaping negative mood. <strong>Aim:</strong> this research was conducted with the aim of psychometric analysis of the comprehensive version of the Substance Use Motives Measure (SUMM) in adolescents. <strong>Methods:</strong> In this descriptive survey research, from the statistical population of the second high school boys in the 11th district of Tehran in the academic year 1402-1403, a number of 402 adolescents (mean age: 16.93) were selected using the convenience sampling method, responded to the SUMM, and Self-Efficacy-Short Version (SE-SV, Muris, 2001) and the Multidimensional Scale of Perceived Social Support (MSPSS, Zimet, Dahlem, Zimet & Farley, 1988). <strong>Results:</strong> The results of the confirmatory factor analysis showed that the SUMM had good factorial validity with an eight-factor structure consisting of enhancement, social, conformity, anxiety-coping, depression-coping, boredom-coping, self-expansion & performance motives. In addition, the results related to the correlation between the multiple dimensions of the comprehensive model of substance use motives with self-efficacy beliefs and perceived social support defended the criterion validity of the SUMM. Besides, the Cronbach's alpha result showed that the subscales of the SUMM were internally consistent. <strong>Conclusion:</strong> the results of this research, while defending the sound of the theoretical foundation of the comprehensive model of the substance use motives measure in adolescents, showed that the SUMM to understand the reasons for their use of different substances is technically valid and reliable. https://apsy.sbu.ac.ir/article_104638_11834c75b883fd39ce98c754fe483275.pdf