“…Moving forward, with the existing methods as inspirations (but also hopefully creative floors, not ceilings), we see several promising research lines. For example, in recognition of the limitation that much of the previous literature on between and withintherapist effects, and predictors of them, focuses largely on patients' symptomatic and functional outcomes, it will be important for future research to examine therapist differences, and how best to leverage them, on other out comes that may be of interest to patients beyond symptoms/functioning (e.g., empowerment, agency/selfefficacy, improvements in selfesteem and selfconcept; for a review, see Constantino et al, 2022). Additionally, investigators can continue to use correlational designs to identify additional mutable therapistlevel predictors (e.g., humility) of more positive between therapist effects on global or specific outcomes (see .…”