Nida LimsuwanThanavadee PrachasonMahidol University2019-08-282019-08-282018-01-01Journal of Family Therapy. (2018)14676427016344452-s2.0-85055894232https://repository.li.mahidol.ac.th/handle/123456789/47388© 2018 The Association for Family Therapy and Systemic Practice The 15-item Systemic Clinical Outcome and Routine Evaluation (SCORE-15) Thai version was developed. This study aims to assess the test-retest reliability and the criterion validity of the SCORE-15 Thai version. The assessment of the test-retest reliability was performed on twenty-four non-clinical participants who gave two ratings two to four weeks apart. Furthermore, sixty-two clinical and seventy-three non-clinical subjects were included for the assessment of the criterion validity. The SCORE-15 Thai version exhibited excellent test-retest reliability with an intraclass correlation coefficient of 0.94. The validity study revealed that the effect sizes of score differences between clinical and non-clinical groups were large (0.90–1.85). In conclusion, the SCORE-15 Thai version can be a choice for routine clinical practice to determine family functioning in systemic family therapy. Practitioner points: Assessment of family functioning is an essential process for both initial evaluations and monitoring the progress of family interventions The SCORE-15 Thai version exhibited excellent test-retest reliability and criterion validity The SCORE-15 Thai version can be used as an instrument to determine family functioning in clinical practice and research.Mahidol UniversityPsychologySocial SciencesSCOPUS10.1111/1467-6427.12248