Education programs in science, technology, engineering, and mathematics (STEM) fields are intended to enhance the nation's global competitiveness. The Government Accountability Office (GAO) reported in 2012 that there were more than 200 federal STEM education programs in fiscal year 2010. Since then, this portfolio of programs has changed. GAO was asked to review the landscape of federal STEM education programs. This report examines (1) how the federal investment in STEM education programs changed from 2010 to 2016, and (2) the extent to which the STEM education portfolio has been assessed. To answer these questions, GAO administered a web-based questionnaire to all federal STEM education programs funded in fiscal year 2016 and analyzed the results. GAO also reviewed relevant federal laws and agency documents, examined the implementation of relevant assessment requirements, and interviewed officials from relevant federal agencies. GAO is making four recommendations, including three to the Committee on STEM Education to review performance assessments of STEM education programs, document those assessments, and report programs' participation rates of underrepresented groups. The Committee on STEM Education agreed with GAO's recommendations.