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The study included 731 families that met two criteria. First, they participated in the Supplemental Nutrition Program for Women, Infants, and Children (WIC) when their son or daughter was between 2 years 0 months old and 2 years 11 months old. Second, they met the study’s criteria for being at risk for behavior problems—defined as one standard deviation or more above normative averages in at least two of three domains: (1) child behavior problems (for example, conduct problems or high-conflict relationships with adults); (2) primary caregiver problems (for example, maternal depression, daily parenting challenges, self-report of substance or mental health diagnosis, or status as a teen parent at first birth); and (3) socioeconomic status (low caregiver educational achievement or low family income based on WIC criteria). Screening was conducted in 2002 and 2003. Of the 731 primary caregivers who agreed to participate, 41 percent had a high school diploma or GED, 32 percent had one or two years of post-high school training, and 24 percent had less than a high school diploma or GED. More than two-thirds of the randomized sample had an annual income below $20,000. Of the 731 children in the study, 50 percent were European American, 28 percent were African American, 13 percent were biracial, and 9 percent were from another racial group. Thirteen percent were Hispanic. The children were 29.9 months old on average at the time of the age 2 assessments. Forty-nine percent of the children were female, and 58 percent lived in two-parent households.