Each sampled school provides a list of grade-eligible enrolled students. From each list, a systematic random sample draws 30 students (if possible) for each assessment session assigned to the school. This student sample design produces both aggregate estimates and estimates of various demographic populations of interest.
Most sampled schools followed the established student sampling and participation procedures to select the students for its assessment sessions. Participating jurisdictions with multiple assessment sessions in their sampled schools could opt for a reduced sample option to shrink their student sample sizes.