“…Using a singleitem measure is a common practice to investigate client perceptions of therapy (e.g., Fridman, 2010;Fuller & Hill, 1985;Horvath, Marx, & Kamann, 1990), with face-valid items typically yielding high levels of predictive validity (Hoyt, 2002). Single-item measures of helpfulness are also known to be stable over time, consistent between clients and therapists, and predictive of session outcome measures (Hill et al, 1994). They are also commonly used as a treatment outcome (e.g., Hill, et al, 1994;Elliott, 1985;Liddle, 1996) and have been found to hold concurrent validity with clients' overall satisfaction with their therapist (Conte, Buckley, Picard, & Karasu's, 1994).…”