For theorists, the book includes a thoughtful critique by Steve Hinshaw and Teron Park on variable-centered versus person-centered research and the implications for research on disruptive behavior disorders. Thought-provoking observations abound. Richard Tremblay and his colleagues observe that they found no interventions in pregnancy or in infancy aimed specifically at prevention of disruptive behavior disorders despite the fact that chronic disruptive behavior often begins in the first 700 days of life. Lahey, Pliszka, Frick, Barkley, Kavale, Werry, Pat Chamberlain, and many others provide thoughtful insights and well-referenced analysis.