“…It is therefore recommended that future research adopt a multimodal approach to assessing changes in anxiety (e.g., clinician-ratings, physiological assessments), as well as clinician and independent-observer ratings of therapist alliance and group cohesion. Novel independent-observer calculation methods are currently being evaluated (e.g., Petrik, Farchione, Dobson, & Kazantzis, 2015) along with examinations within therapist practices as a function of data source (Kivlighan, Gelso, et al, 2015), which both show promise. Second, as only one form of psychotherapy (tCBT) was assessed in the current study, it is unclear whether the current results would extend to other group-based interventions (Hofmann & Barlow, 2014), and to what extent other unmeasured client attributes, such as attachment style (Marmarosh et al, 2014) may moderate process-outcome relations (see Lorenzo-Luaces et al, 2014).…”