[Excerpt] The Scientists and Engineers Statistical Data System (SESTAT) is a comprehensive and integrated system of information about employment, education, and demographic characteristics of scientists and engineers in the United States. It is intended to provide policymakers, researchers, and planners with high-quality data on the size, composition, and employment patterns of the nation's science and engineering (S&E) workforce. The detailed statistical tables presented here provide information on the number and median salaries of scientists and engineers by field of highest degree and occupation; demographic characteristics, such as sex, race/ethnicity, citizenship, disability, and age; and employment related characteristics, such as sector of employment and primary/secondary work activity. The technical appendix provides methodological information about the SESTAT data system, including coverage, component surveys (and links to questionnaires), editing and imputation, sample weights, sampling error and standard error tables, and selected definitions and explanations, including links to degree and occupation classification taxonomies used in theSESTAT.