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Background and Objectives: Psychological flexibility is the main goal of acceptance and commitment treatment. However, an efficient tool is needed to measure it.Thus, The aim of this study was to investigate the psychometric properties of the Persian version of the Comprehensive assessment of Acceptance and Commitment Therapy processes (CompACT) Scale. Methods: The statistical population of the present study included all people aged 18 to 60 years in the period from August to October 1400. The statistical sample of the study included 256 people who were selected by available sampling method through online call. In order to evaluate the convergent and divergent validity, the second version of the Acceptance and Practice Questionnaire (AAQ - II), the difficulty in emotion regulation scale (DERS-16) and the Depression, Anxiety and Stress Scale were used. The factor structure of the questionnaire was examined through confirmatory factor analysis. Reliability was performed using Cronbach's alpha method and retesting and analyzing the data with version 25 of SPSS software and version 8.8 of LISREL. Results: The results of confirmatory factor analysis, as in the original form, confirmed three factors: Openness to Experience, Behavioral Awareness and Valued Action. Also, Cronbach's alpha coefficient for the whole scale is 0.89 and for the subscales of Openness to Experience, Behavioral Awareness and Valued Action were equal to 0.91, 0.88, 0.85, respectively. In addition, the four-week retest coefficient for the whole questionnaire was 0.80 and for the subscales of Openness to Experience, Behavioral Awareness and Valued Action were equal to 0.89, 0.78, 0.79, respectively. Also, correlation coefficients indicated favorable convergent and discriminant validity of the questionnaire (P<0/001). Conclusion: According to the obtained results, it can be said that the Comprehensive assessment of Acceptance and Commitment Therapy processes (CompACT) Scale is a reliable and valid scale for measuring psychological flexibility.