STEP-UP, which stands for STEM Trends in Enrollment & Persistence for Underrepresented Populations, is a study project that is investigating the underrepresented undergraduate students' participation in the Science, Technology, Engineering, and Mathematics (STEM) fields at large, public, research universities. It focuses on the experiences of undergraduate women, students of color, and low-income students in STEM majors, and factors that impact their enrollment, persistence, and degree completion in the sciences. The STEP-UP project is funded by the National Science Foundation (NSF).