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Prevention experiments with children have targeted the development of antisocial behavior and confirm the hypothesis that early childhood factors are important precursors of delinquent behavior and that a cumulative effect model best fits the data. Experiments have aimed to prevent criminal behavior or one of three important delinquency risk factors: socially disruptive behavior, cognitive deficits, and poor parenting. Experiments with juvenile delinquency as an outcome demonstrate that positive results are more likely when interventions are aimed at more than one risk factor, last for a relatively long period of time, and are implemented before adolescence. Experiments featuring early childhood interventions with socially disruptive behavior, cognitive deficits, or parenting as an outcome generally have positive effects. The majority of studies, small-scale confirmation or replication experiments, need to be followed by …