ADHD,CNS dysfunction or damage, and early extremes of temperament can predispose a child to conduct disorder. Propensity to violence correlates with CNS dysfunction and signs of severe psychopathology, such as delusional tendencies. Longitudinal temperament studies suggest that many behavioral deviations are initially a straightforward response to a poor fit between a child s temperament and emotional needs, on one hand, and parental attitudes and child-rearing practices, on the other.