In Preschool A, group membership was surveyed at a set time every morning. Several study days were also devoted to point sampling, taking a sample every 15 min for the duration of the morning. In all, 106 point samples were taken, each of which recorded the group membership of every child present. In the busier environment of Preschool B, point sampling was conducted on a more infrequent and ad hoc basis (18 samples, spread over nine study days).
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