We investigated whether specific input helps 3-1/2-year-olds discover that the last word in a count represents its cardinal value (i.e., the cardinal word principle). In Study 1, we contrasted four training approaches. The only approach to yield significant improvement was to label a set's cardinality and then immediately count it. This training…

Do children learn more in full-day kindergartens than half-day programs? If full-day kindergarten increases learning, are kindergartners in some schools particularly advantaged by their full-day experience? We address these questions with a nationally representative sample of over 8,000 kindergartners and 500 U.S. public schools that participated…

Conducted a cost-benefit analysis of a federally financed comprehensive early childhood program, the Title I Chicago Child-Parent Centers. Used data for 1,539 program and comparison group children. Findings show that an established public program can provide benefits that far exceed costs. Outlines key elements of program effectiveness. (SLD)