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article i nfo Objective:Thisstudy (ID:NCT01205906) comparedtheimpact of theworkingalliancebetween the therapistand the client on treatmentoutcome ina group and an Internet-based cognitive behavior therapy (GCBT vs. ICBT) for chronic tinnitus. Methods: The Working Alliance Inventory — Short Revised (WAI-SR, scale range: 1-5) was administered to 26 GCBT and 38 ICBT participants after treatment weeks 2, 5, and 9, and the Tinnitus Handicap Inventory (THI) be- fore and after the treatment. Results: High alliance ratings were found in both ICBT (WAI-SR total scores at week 9:M =3 .59,SD= 0.72) and GCBT (WAI-SRtotal scoresatweek 9: M =4 .20,SD= 0.49), butsignificantlyhigher ratings occurred inGCBT on mostWAI-SRscales(psb .01).Significanttime× groupinteractionsformostWAI-SRscalesindicateddifferences in alliance growth patterns between the treatments (ps b .001). Residual gain scores for the therapy outcome measure 'tinnitus distress' were significantly correlated with the agreement on treatment tasks between thera- pist and client in ICBT (r =. 40,p = .014) and with the affective therapeutic bond in GCBT (r =. 40,p =.043) at mid-treatment (week 5). Conclusion: More time was needed to build a strong alliance in ICBT although GCBT yielded generally higher alliance ratings. Moreover, different aspects of the therapeutic alliance might be important for treatment success in ICBT versus GCBT.