Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 8 2 2013 06 15 80 5 Tahereh Pashaei Department of Health education and Promotion, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ; Addiction Research Center, Tehran University of Medical sciences, Tehran, Iran. Omran M Razaghi Department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran Abbas Rahimi Foroushani Department of Epidemiology and Biostatistics school of public of public health, Tehran University of Medical Sciences, Tehran, Iran Mahmoud Ghazi Tabatabaei Department of Health and social Demography, Faculty of Social Sciences, University of Tehran. Tehran, Iran Maryam Moeeni Department of Management and Health Economics, School of Public Health, Tehran University of Medical Sciences, Tehran. Iran Nigel E Turner Social Epidemiological Research & Problem Gambling Institute of Ontario Centre for Addiction and Mental Health, Toranto, Canada Vandad Sharifi Department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran Davoud Shojaeizadeh Department of Health education and Promotion ,School of Public Health ,Tehran University of Medical Sciences, Tehran , Iran Addiction Research Center, Tehran University of Medical sciences, Tehran, Iran 2015 10 14 Objective: Inventory Drug-Taking Situations (IDTS) is a universal instrument used to determine high-risk situations resulting in drug abuse. The aim of this study was to translate this questionnaire to Farsi, and to assess its validity and reliability by applying it to Iranian drug users. Methods: As a psychometric study, 300 drug users participated in a treatment program in National Center of Addiction Studies filled in a version of Inventory of Drug Taking Situations. We assessed face and content validity, internal consistency, and reliability based on the completed questionnaires, using test-retest method and confirmatory factor analysis. Results: Internal consistency analysis confirmed that all subscales of IDTS were reliable (Cronbach alpha was ranging from 0.7 to 0.81). Analyses indicated that each of the subscales was unifactorial; however, unpleasant emotions had a second eigenvalue that was nearly large enough to be a second factor. Confirmatory factor analysis was used to test the fit of the data to the original version of IDTS. Based on goodness of fit indices, we found that all factors were fitted (χ2/df=1.43, GFI=0.98, RMSEA=0.038). The test-retest reliability was satisfactory(r>0.6). Conclusion: The Farsi version of Inventory of Drug Taking Situations was shown to be a valid and reliable instrument to apply in clinical and research settings in Iran. https://ijps.tums.ac.ir/index.php/ijps/article/view/184 https://ijps.tums.ac.ir/index.php/ijps/article/download/184/180