en کاردرمانی Occupational therapy پژوهشي Original Research Articles <p style="margin: 0in 0in 10pt; text-align: justify; line-height: 150%;"><strong>Objectives:</strong> Handwriting problems are among the most frequent reasons for case referrals to school-based occupational therapy centers. Persian Handwriting Assessment Tool (PHAT) is a valid tool available in Iran to evaluate handwriting components in school-aged children. However, its reliability has not been investigated yet. This study aimed to determine the reliability of the PHAT in Iranian primary school-aged children.<br> <strong>Methods:</strong> The current methodological study was performed in Tehran city, Iran during 2015-2016. In total, 208 primary school-aged students participated in this study that aimed to investigate the internal consistency of the PHAT. Forty-eight students were also recruited to examine the intra- and inter-rater reliabilities of the PHAT. Selection of the schools and sampling were conducted using the random cluster sampling method.<br> <strong>Results:</strong> Results suggested good to excellent internal consistency (&alpha;=0.84 to 0.99) for the measures of PHAT in dictation and copying domains. Intra-rater reliability of the PHAT ranged from 0.87 to 1.00. Furthermore, PHAT inter-rater reliability ranged from 0.7-1.00.<br> <strong>Discussion: </strong>The PHAT is a reliable tool to evaluate handwriting components in primary school-aged children. It can also be useful for Iranian therapists to identify primary school students with handwriting problems.</p> Educational assessment, Handwriting, Primary schools, Reliability 353 360 http://irj.uswr.ac.ir/browse.php?a_code=A-10-626-2&slc_lang=en&sid=1 Naser Havaei naser_havaei@yahoo.com 1 No Department of Occupational Therapy, Faculty of Rehabilitation Sciences, Tabriz University of Medical Sciences, Tabriz, Iran. Akram Azad azad.a@iums.ac.ir 2 0000-0001-7544-4878 Yes Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Mehdi Alizadeh-Zarei mehdii.alizadeh@yahoo.com 3 No Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Abbas Ebadi ebadi1347@yahoo.com 4 No Behavioral Sciences Research Center, School of Nursing, Baqiyatallah University of Medical Sciences, Tehran, Iran.