https://www.fcd-us.org/including-community-and-parent-engagement-in-estimating-the-national-costs-of-an-integrated-prek-3rd-program/
Lawrence O. Picus and Associates review research on parent engagement programs at the PreK-3rd level, and identify programs with greater promise of academic success for children.
An earlier April 2009 study conducted by Lawrence O. Picus and Associates uses their evidence-based approach to estimate the national and state costs of providing PreK-3rd.