This subcontract between the National Bureau for Economic Research and the University of North Carolina at Chapel Hill involves the sharing of archived data from the Abecedarian Project and Project CARE, two randomized trials of early childhood educational interventions. The treatment phases of these studies were carried out between 1972 and 1988. Participants were all from low-income families and across studies were 96% African American. Treatment was provided either for 8, 5, 3, or no years for children assigned to the groups. Follow up data were collected at age 12, 21, and 30 years; Abecedarian children also have data at age 15. Electronic data sets with all identifiers removed will be shared with Dr. James Heckman, PI of the prime contract, who is at the University of Chicago. Dr. Frances Campbell and Dr. Elizabeth Pungello will collaborate in reporting of findings from the economic analyses conducted at the University of Chicago.