Step into an American preschool classroom today and you are likely ... as teachers steer students through a highly structured schedule, herding them from one activity to another and signaling ...

In addition to analyzing the children of the original participants, Heckman surveyed the siblings of participants who were not in the preschool classroom, but were in the home at the time.

Regulations that hold preschool class sizes at or below 20 and that require one teacher for every 10 children, are largely adequate for most children, according to a recent study that analyzed ...