Tehran University of Medical Sciences Journal of Medical Ethics and History of Medicine 2008-0387 7 1 2015 10 14 103 103 Omid Asemani Assistant Professor, Department of Medical Ethics and Philosophy of Health, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. Mohammad Taghi Iman Professor, Department of Sociology, Shiraz University, Shiraz, Iran. Mohammad Khayyer Professor, College of Education and Psychology, Shiraz University, Shiraz, Iran. Seyed Ziaaddin Tabei Professor, Department of Medical Ethics and Philosophy of Health, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. Farkhondeh Sharif Professor, Department of Psychiatric Nursing, Community Based Psychiatric Care Research Center, College of Nursing & Midwifery, Shiraz University of Medical Sciences, Shiraz, Iran. Marzieh Moattari Professor, Department of Nursing, College of Nursing & Midwifery, Shiraz University of Medical Sciences, Shiraz, Iran. 2015 10 14 There is a shortage of quantitative measures for assessing the concept of responsibility as a fundamental construct in medical education, ethics and professionalism in existing literature. This study aimed to develop an instrument for measuring responsibility in both undergraduate and graduate medical students during clinical training. Instrument content was based on literature review and mainly qualitative data obtained from a published grounded theory research. The draft questionnaire (Persian version) was then validated and revised with regard to face and content validity. The finalized 41-item questionnaire consists of four domains that were identified using factor analysis. Test-retest reliability and internal consistency were also assessed. Test-retest reliability was rather high, ranging between 0.70 and 0.75 for all domains. Cronbach's alpha coefficients were 0.75 - 0.76 for all domains and 0.90 for the composite scale of the whole questionnaire. Correlations between the four domains of the instrument were also satisfactory (r ≤ 0.47 for most domains). The correlation between each domain and the composite scale was higher than its correlation with other domains (r ≥ 0.79 for most domains). The instrument demonstrated good construct and internal validity, and can be suitable for measuring the concept of responsibility in practice in different groups of undergraduate and graduate medical trainees (MTs). https://jmehm.tums.ac.ir/index.php/jmehm/article/view/103 https://jmehm.tums.ac.ir/index.php/jmehm/article/download/103/99