Bandura and Walters restricted their sample to boys of average or above average intelligence, from intact homes, with steadily employed parents, whose families had been settled in America for at least three generations. No children from minority groups were included either. In other words, the boys were from apparently typical, White, middle-class American families. And yet, half of the boys studied were identified through the county probation service or their school guidance center as demonstrating serious, repetitive, antisocial, aggressive behavior (Bandura & Walters, 1959).