en The Effect of Grit on Task Performance and Organizational Citizenship Behavior with Mediating Work Engagement تخصصي Special پژوهشي Research <div dir="ltr" style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif">In this study the effect of grit on task performance and organizational citizenship behavior with mediating work engagement was investigated. The research design was cross sectional. The research sample consisted of 287 of employees an organization &nbsp;that were selected through simple sampling method. The instrument used in this study were grit questionnaire (Duckworth et al. 2007), work engagement scale (Utrecht, Shoufeli and Salanova 2002), task performance questionnaire (oodman and Svyantek ,1999) and organizational citizenship behavior questionnaire (Organ and Kanofsky,1989). Data was analyzed by path analysis using SPSS and AMOS version 24. Bootstrap method was used to test the indirect paths effects. Results showed that direct paths of job grit to job engagement, task performance and organizational citizenship behavior, were significant. The results also showed that the indirect paths of job grit to task performance and &nbsp;organizational citizenship behavior through job engagement were significant.</span></span></span></div> &nbsp; <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif">In this study the effect of grit on task performance and organizational citizenship behavior with mediating work engagement was investigated. The research design was cross sectional. The research sample consisted of 287 of employees an organization &nbsp;that were selected through simple sampling method. The instrument used in this study were grit questionnaire (Duckworth et al. 2007), work engagement scale (Utrecht, Shoufeli and Salanova 2002), task performance questionnaire (oodman and Svyantek ,1999) and organizational citizenship behavior questionnaire (Organ and Kanofsky,1989). Data was analyzed by path analysis using SPSS and AMOS version 24. Bootstrap method was used to test the indirect paths effects. Results showed that direct paths of job grit to job engagement, task performance and organizational citizenship behavior, were significant. The results also showed that the indirect paths of job grit to task performance and &nbsp;organizational citizenship behavior through job engagement were significant.</span></span></span></div> &nbsp; grit, work engagement, task performance, organizational citizenship behavior grit, work engagement, task performance, organizational citizenship behavior 63 93 http://ijpb.ir/browse.php?a_code=A-10-239-3&slc_lang=en&sid=1 Abdolzahra Naami Abdolzahra Naami naamiabdol@scu.ac.ir 10031947532846003611 10031947532846003611 Yes Department of Psychology, Shahid Chamran University of Ahvaz, Ahvaz, Iran Department of Psychology, Shahid Chamran University of Ahvaz, Ahvaz, Iran Kowsar Simiarian Kowsar Simiarian simyary@yahoo.com 10031947532846003612 10031947532846003612 No Department of Educational Psychology, Science and Research Branch, Islamic Azad University, Tehran, Iran Department of Educational Psychology, Science and Research Branch, Islamic Azad University, Tehran, Iran