Capitalizing on these investments and the momentum generated by Iowa’s PDG, this study will integrate HS enrollment and program partnership data into the representative cohort study of over 27,000 Iowa kindergartners used for PDG that already includes administrative datasets covering birth through grade 1. Using these data, this study will provide the following information for Iowa’s children who attended HS: (1) patterns of care multiplicity; (2) child and family characteristics relating to care multiplicity experiences; (3) effects of care multiplicity on children’s school performance (risk vs. on-target status) at kindergarten and first grade (i.e., literacy, math, attendance, and suspension history); and (4) the role of program partnership between HS and co-serving ECE programs on school performance.