How many schools and students participate in NAEP and when are the data collected during the school year?

The number of students selected to be in a NAEP sample depends on whether it is a national-only sample or a combined state and national sample. In the national-only sample, there are approximately 10,000 to 20,000 students. In a combined national and state sample, there are approximately 3,000 students per participating jurisdiction from approximately 100 schools. Typically, 45 to 55 jurisdictions participate in such an assessment.

Data for the national and state NAEP are collected at the same time during the winter. Data for the national long-term trend assessments are collected in the fall for 13-year-olds, in the winter for 9-year-olds, and in the spring for 17-year-olds. Other NAEP special studies can occur at different points throughout the school year.