en فیزیوتراپی Physiotherapy پژوهشي Research <strong>Background and Objectives</strong>: Chronic functional constipation is a prevalent and symptom-based disorder of the gastrointestinal tract. Constipation takes several different forms among patients. The Wexner Constipation Scoring System (WCSS) was developed to present a uniform tool for the assessment of chronic functional constipation. The purpose of this study was to provide the Persian version of WCSS and assess its validity and reliability.<br> <strong>Methods</strong>: WCSS was translated into Farsi. After being linguistically validated, the Persian version of the WCSS was administered to a sample of 76 patients with chronic functional constipation. Reliability tests were used to evaluate the internal consistency (the Cronbach alpha) and reproducibility (Intraclass Coefficient Correlation [ICC]) of the tool. The validation studies were conducted to assess the convergent validity (Correlated with the Patient Assessment of Constipation Symptom [PAC-SYM]) and Concurrent Validity (Correlated with Patient Assessment of Constipation Quality of Life [PAC-QOL]) of the tool, too.<br> <strong>Results</strong>: The Cronbach alpha for total scores was 0.66 and the ICC was 0.85 (0.77-0.90, 95% CI). The total score of WCSS was significantly correlated with the total scores of PAC-SYM (r=0.67) and PAC-QOL (r=0.61).&nbsp;<br> <strong>Conclusion</strong>: The linguistic and psychometric evaluation demonstrated good validity and reproducibility of the Persian version of WCSS.<br> <div style="text-align: right;"></div> Constipation severity, Persian version, Reliability, Validity 17 26 http://fdj.iums.ac.ir/browse.php?a_code=A-10-128-2&slc_lang=en&sid=1 Parnian Mirbehresi pbehresi@gmail.com 10031947532846001885 10031947532846001885 Yes Department of Physiotherapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Afsaneh Nikjooy afsanehnikjooy@yahoo.com 10031947532846001886 10031947532846001886 No Department of Physiotherapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Javad Sarrafzadeh j.sarrafzadeh@gmail.com 10031947532846001887 10031947532846001887 No Department of Physiotherapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Holakoo Mohsenifar mohsenifarpt@gmail.com 10031947532846001888 10031947532846001888 No Department of Physiotherapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.