“…However, evidence is accumulating for the variability among therapists as well (Beutler, 1997;Blatt, Sanislow, Zuroff, & Pilkonis, 1996;Crits-Christoph & Mintz, 1991;Kim, Wampold, & Bolt, 2006;Lafferty, Beutler, & Crago, 1989;Lambert, 1990;Luborsky et al, 1986;Luborsky, McLellan, Diguer, Woody, & Seligman, 1997;Luborsky, McLellan, Woody, O'Brien, & Auerbach, 1985;Wampold & Brown, 2005). Also, two studies using LC regression analysis reported large between-therapists differences (Sandell et al, 2006a(Sandell et al, , 2006b. Obviously, in this study, as for most psychotherapy studies, there was a partial confounding between patients and therapists, because each patient had only one therapist, although each therapist may have had more than one patient, and there was no random selection between the two.…”