The National Assessment of Educational Progress (NAEP) is the largest nationally representative and continuing assessment of what the nation's students know and can do in various subjects such as civics, mathematics, reading, and U.S. history. The results of NAEP are released as The Nation's Report Card. District staff play an essential role in NAEP. Superintendents and district staff can work closely with principals to explain the importance of the assessment to teachers and participating students. When students take part in the assessment and give their best effort, NAEP results provide the most accurate measure possible of student achievement across the country. Results will be released at the national and state levels for the mathematics and reading assessments at grades 4 and 8. Each student will be assessed in only one subject. This brief report describes how NAEP will be administered and which grades and subjects will be assessed in 2021. [For the 2019-2020 edition of "Facts for Districts," see ED615370.]