Forty-two states and the District of Columbia, through 57 pre-K programs, have introduced substantial innovations in their early education systems by developing the infrastructure, program sites, and workforce required to accommodate pre-K education. These programs now serve nearly 30 percent of the nation's 4-year-olds and 5 percent of 3-year-olds. In recent years, there has been increasing interest in assessing how well these short- and long-term goals have been achieved. What should we expect pre-K to produce for our society? How can we ensure that children who attend these programs get as much out of them as they can?
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