The sessions occurred three times a week, during the children’s regularly
scheduled mathematics period. Most sessions took place in a small, quiet room with two
desks and chairs. Occasionally, the sessions were held in an empty classroom. Sessions
took place from 1 p.m. to 1:40 p.m. on Tuesdays and Wednesdays, and from 10:40 a.m.
to 11:20 a.m. on Fridays.