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Most children's behavior progresses to a certain level of dysfunction and then plateaus or decreases (Loeber, 1990). In a large longitudinal study of children initially aged 4 to 12 years, (Verhulst, Koot et al. 1990) found that rates of aggressive and externalizing behaviors decreased over a four-year period for children of all ages (White, notes). Progression of conduct problems into adulthood is more likely for children with a greater diversity of behavioral symptoms which manifest across a greater variety of settings, and with an earlier onset (Loeber, 1982; Robins, 1991). For example, Robins (1991) reported that only 0.9% of children who displayed relatively few conduct problems at age 12 years, developed Antisocial Personality Disorder (ASPD), while 71% of those who displayed severe wide-ranging problems at age six years, met later diagnostic criteria for ASPD. Of those whose problems persist, not all have serious forms of conduct problems in adulthood (Dumas, 1989;...

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