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A series of policy changes begun seven years ago to help create more equitable enrollment in Chicago Public Schools’ pre-K programs has worked, according to education researchers at three Chicago organizations. Enrollment tripled among Black students and children from the city’s lowest-income neighborhoods, they found.

If the key factors — prioritizing full-day over part-time seats, concentrating them in historically underserved neighborhoods and centralizing enrollment — sound obvious, leaders in cities hoping to bolster their early childhood education system might want to examine the changes Chicago made...