We describe the challenge of college non-completion in the U.S. and a variety of explanations for the high rate of non-completion. We then provide an overview of the implementation of and evidence from eight specific college completion interventions designed to increase college completion rates through a comprehensive set of services. The eight interventions that we review have all been implemented in the past decade and have been evaluated through randomized controlled trials (RCT). After we describe the eight featured programs and the evidence on their effectiveness, we discuss the potential to replicate these programs and deliver them at scale. Finally, we offer some recommendations for future research, with the goal of establishing a body of practical evidence for organizations and policymakers to learn from as they work to address the college completion crisis. [The working paper was revised in Feb 2021 and prepared for the Comprehensive Approaches for Student Success convening (Sep 9 2020).]