Brown, RuthSoutham-Gerow, MichaelMcLeod, BryceWheat, EmilyTully, CarrieReise, StevenKendall, PhilipWeisz, John2019-09-302017-09-25Brown, Ruth C., Michael A. Southam-Gerow, Bryce D. McLeod, Emily B. Wheat, Carrie B. Tully, Steven P. Reise, Philip C. Kendall, and John R. Weisz. 2017. The Global Therapist Competence Scale for Youth Psychosocial Treatment: Development and Initial Validation: 1-17.0021-9762http://nrs.harvard.edu/urn-3:HUL.InstRepos:41426692OBJECTIVE: We describe the development and initial psychometric properties of the observer-rated Global Therapist Competence Scale for Youth Psychosocial Treatment (G-COMP) in the context of cognitive-behavioral treatment (CBT) for youth anxiety disorders. METHOD: Independent coders rated 744 sessions from a sample of 68 youth (mean age = 10.56 years) using the G-COMP and the instruments of alliance, involvement, CBT adherence, CBT competence. RESULTS: Inter-rater reliability coefficients, ICC(2,2), were greater than .60 for the 5 G-COMP domain scores. G-COMP scores yielded small to medium correlations with instruments of alliance (rs = .17-.44) and youth involvement in treatment (rs = .08-.53), and medium to large correlations with instruments of CBT competence and adherence (rs = .26-.63). Therapists in the research setting were rated higher compared to newly trained therapists in community clinics. CONCLUSION:Preliminary reliability and validity of the G-COMP are promising, but future research is needed with non-CBT samples.en-USJournal Article2019-09-3010.1002/jclp.22537