Background: Determining the variables influencing students' academic performance is one of the main preoccupations in medical colleges. Therefore, this study examined the effect of the Big Five personality traits on medical students' academic performance, considering the mediating role of self-efficacy.Methods: We applied a cross sectional research design using a PLS-SEM approach. A total of 249 medical students participated in this study. Two valid and reliable questionnaires, including Big Five Inventory (BFI-10) and New General Self Efficacy (GSE) were used. Data were analyzed using both SPSS 18 and PLS2 software.Results: The validity and reliability of the questionnaires were confirmed by confirmatory factor analysis. The results revealed that openness (β= 0.16, p<0.001), conscientiousness (β=0.22, p<0.001), agreeableness (β=0.19, p<0.001), and self-efficacy (β=0.24, p<0.001) had a significant positive and direct effect on academic performance. Neuroticism (β=-0.21, p<0.001) had a significant negative and direct effect on academic performance. Also, openness (β=0.47, p<0.001) and conscientiousness (β=0.33, p<0.001) had a direct positive effect on self-efficacy. Neuroticism (β=-0.15, p<0.001) had a direct negative effect on self-efficacy. Moreover, the results showed an indirect positive effect of conscientiousness (β=0.08, p<0.001) and openness (β=0.11, p<0.001) on academic performance through self-efficacy. In addition, the results showed that neuroticism (β=-0.03, p<0.001) had an indirect negative effect on academic performance through self-efficacy. Conclusion:This study discovered the relationships between personality traits, self-efficacy, and academic performance of medical students. The results showed that individual differences in personality traits directly and indirectly play an essential role, through selfefficacy, in contributing to the students' academic performance.

This study examines the relationship between EFL teachers’ quality of work life (QWL) and their job motivation. 126 Iranian EFL teachers currently working in high schools of Tehran were administered two questionnaires that assessed their motivation and quality of work life. Participants’ motivation to teach was assessed using a questionnaire developed by Noe & Bachhuber (1990) which includes three major subscales: career insight (8 items), career identity (5 items), and career resilience (13 items). In addition this study used Walton’s (1973) widely used quality of work life questionnaire. This 29-item questionnaire includes eight subscales: adequate and fair compensation (4 items), safe and healthy working (3 items), continued growth and security (3 items), constitutionalism in the work organization (5 items), the social relevance of work life (3 items), total life space (4 items), social integration in the work organization (4 items), and human progress capabilities (3 items). The results revealed that Iranian EFL teachers experience medium to low levels of motivation and QWL. In addition, a significant relationship was found between QWL categories and job motivation. Further, the best QWL predictors for teacher motivation were identified. The findings of this study are hoped to serve as a reference for principals and educational decision-makers in bringing about higher levels of motivation for language teachers.