"This study presents a review and synthesis of current research that addresses the potential for interventions of various forms in early childhood to improve outcomes for participating children and their families. In this report, the authors consider the potential consequences of not investing additional resources in the lives of children, the range of early intervention programs, the demonstrated benefits of interventions with high-quality evaluations, the features associated with successful programs, and the returns to society associated with investing early in the lives of disadvantaged children. Their findings indicate that a body of sound research exists that can guide resource allocation decisions. This evidence base sheds light on the types of programs that have been demonstrated to be effective, the features associated with effective programs, and the potential for returns to society that exceed the resources invested in program delivery." By: Lynn A. Karoly, M. Rebecca Kilburn, Jill S. Cannon, RAND Labor and Population, 2005.
Summary Report also available in PDF at: http://www.rand.org/pubs/monographs/2005/RAND_MG341.sum.pdf.