This article describes a case study in the use of the Family Check-Up (FCU), a family-based and ecological preventive intervention for children at risk for problem behavior. The FCU is an assessment-driven intervention that utilizes a health maintenance model; emphasizes motivation for change; and offers an adaptive, tailored approach to intervention. This case study follows one Caucasian family through their initial assessment and subsequent treatment for their toddler daughter's conduct problems over a 2-year period. Clinically meaningful improvements in child and family functioning were found despite the presence of child, parent, and neighborhood risk factors. The case is discussed with respect to the findings from a current multisite randomized control trial of the FCU and its application to other populations. (Contains 2 tables and 1 figure.)