The investigators are testing the hypothesis that periodic, tailored, and adaptive interventions delivered to caregivers at school entry will (a) reduce the probability of elevated risk associated with early-onset problem behavior, including the eventual use of drugs and other health-risking behaviors; (b) reduce the likelihood of mental health problems such as childhood depression, anxiety, conduct problems and co-morbidity; and (c) promote children's development of self-regulation, which underlies school readiness, early school literacy academic achievement, and positive peer relations.