Adherence (2, 3) and other measures (4) are used to discriminate between interpersonal and cognitive behavior therapy, as can any clinician with casual familiarity. Of course, psychotherapies overlap: "common factors" (5) have long been acknowledged as essential to treatment (even for pharmacotherapy , which even the authors might accept is not cognitive behavior therapy) and are responsible for significant outcome variance. A supportive alliance provides common ground, allowing therapists to use different techniques, which may then make a difference. Hence, the sometimes different showings of interpersonal therapy and cognitive behavior therapy in randomized controlled trials, e.g., the advantages of interpersonal therapy for more depressed patients in the NIMH Treatment of Depression Collaborative Research Program and HIV-positive depressed patients (7) and the advantages of cognitive behavior therapy for bulimia nervosa (8). Drs. Ablon and Jones reinvented the common factors, artificially conflating them with therapeutic equivalence and blurring actual distinctions.