This report presents key evaluation findings for the National Science Foundation's Louis Stokes Alliances for Minority Participation (LSAMP) program. LSAMP was designed to increase the pool of underrepresented minority students completing bachelor's degrees and pursuing graduate studies in science, technology, engineering and mathematics (STEM). Findings reveal that LSAMP graduates were indeed more likely than national comparison groups to enroll in and complete graduate studies in STEM. Program staff report that LSAMP expanded institutions' ability to develop STEM talent. A research-based descriptive model of the program's implementation is included, establishing a critical link between theory and practice to inform future interventions.