Lytton responds to two critical commentaries in this issue by restating the reasons why it is useful to try to disentangle child effects from parent effects. Argues that 10 convergent lines of research provide evidence that the child's tendencies are stronger contributors to conduct disorder than are parental influences. (RH)

Evaluates theories that explain the origins of conduct disorder and the evidence supporting them. Evidence is interpreted as demonstrating the primacy of the child's contribution to conduct disorder within a reciprocal parent-child interactive system, and thus corroborating control systems theory. Citations number 106. (RH)