This report presents findings from the process and summative (quasi-experimental) evaluation of the Historically Black Colleges and Universities Undergraduate Program (HBCU-UP) of the National Science Foundation (NSF). HBCU-UP seeks to enhance the quality of undergraduate education and research in science, technology, engineering and mathematics (STEM) at HBCUs as a means to broaden participation in the nations STEM workforce. Findings suggest that the HBCU-UP program yielded an intervention model characterized by a core set of capacity-building strategies associated with successful student educational and employment outcomes. HBCU-UP graduates (mostly African Americans) outperform a national comparison sample in graduate degree completion and are more likely to be employed in STEM than African American graduates nationally. The report includes recommendations for future funding and dissemination.