This report provides a snapshot of the extent to which U.S. public schools students are taught by certified and experienced teachers using two available datasets. The Schools and Staffing Survey (SASS) provides a comprehensive picture, as it includes teachers of Kâ12 students in all subjects and the National Assessment of Educational Progress (NAEP) provides a picture specific to grades 4 and 8. In addition, NAEP data are directly related to teachers of two key subjects: reading and mathematics. SASS data are available for the 2011â12 school year and NAEP data are available for 2013 and 2015.