“…The presence of halo effect in scales assessing disruptive behavior disorders has been well documented (e.g., Abikoff, Courtney, Pelham, & Koplewicz, 1993 ;Abikoff & Gittelman,1985;Blunden, Spring, & Greenberg, 1974;Prinz, Connor, & Wilson, 1981;Schachar, Sandberg, & Rutter, 1986). This halo effect appears to be unidirectional in nature (Abikoff et al, 1993;Schachar et al, 1986).…”