For more than a decade, Florida's Palm Beach County has been building a system of prevention and early intervention services to promote and support the healthy development and school readiness of children from birth to age 8. The county began this effort with a set of programs focused on serving families in four targeted geographic areas that have high levels of risk for poverty, teen pregnancy, crime, and child maltreatment. The Children's Services Council of Palm Beach County commissioned Chapin Hall to conduct a longitudinal mixed-methods evaluation of how families use and are affected by this system of services. This paper presents selected findings from the study about the factors that most affected children's development and school readiness, which include good birth outcomes, positive parenting practices, and access to high quality early childhood programs, and concludes with recommendations for improving the service system to support children's readiness for school. (Contains 1 table, 2 figures, 1 box and 2 footnotes.)