Children who attended an intensive preschool and family support program attained higher educational levels, were more likely to be employed, and less likely to have problems with the legal system than were peers who did not attend the program, according to a study funded by the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD). The Child-Parent Center (CPC) early education program is a large-scale, federally funded intervention providing services for disadvantaged 3- to 9-year-olds in Chicago. The researchers identified five key principles of the CPC that they say led to its effectiveness, including providing services that are of sufficient length or duration, are high in intensity and enrichment, feature small class sizes and teacher-student ratios, are comprehensive in scope, and are implemented by well-trained and well-compensated staff.
Reynolds, A. J., Temple, J. A., White, B. A., Ou, S., & Robertson, D. L. (2011). Cost-benefit analysis of the Child-Parent Center early education program. Child Development, 82, 379-404.