Using a 3 X 3 X 3 factorial design, clinical psychologists' (N = 204) evaluations were obtained of the methodology of a bogus psychotherapy outcome experiment that varied on the outpatient population treated and the results. Three types of neurotic outpatients were treated in the bogus study, and the experiment's results indicated that psychoanalytically oriented therapy was more effective than behavior therapy, behavior therapy was more effective than psychoanalytically oriented therapy, or psychoanalytically oriented therapy and behavior therapy were equally effective. The third independent variable was psychologists' theoretical orientation (psychodynamic, behavioral, or eclectic). A significant Orientation X Results interaction was obtained, and the results suggest that psychodynamic clinicians are biased against outcome research that demonstrates the superiority of behavior therapy.