National NAEP reports statistical information about student performance and factors related to educational performance for the nation and for specific student groups in the population (e.g. race/ethnicity, gender). It includes students drawn from both public and nonpublic (private) schools and reports results for student achievement at grades 4, 8, and 12.
These assessments follow subject-area frameworks developed by the National Assessment Governing Board, and use the latest advances in assessment methodology. These assessments are distinguished from NAEP long-term trend, which, although national, uses frameworks and questions that remain constant over time.
As the content and nature of the NAEP instrument evolve to match instructional practice, the ability of the assessment to measure change over time is reduced. While short-term trends can be measured in many of the NAEP subjects (e.g., mathematics, reading), the most reliable instruments of change over time are the NAEP long-term trend assessments.