Over the past decade, the understanding of student mobility patterns has increased considerably through research based in the analysis of longitudinal data sets. A significant challenge to crafting effective policies on student mobility emerges from most states focusing on full-time, 18-to-24-year-old students. While fewer than half of postsecondary students are of traditional college age and just over half are enrolled part-time, a disproportionate amount of political attention is directed to the needs and concerns of flagship institutions, where younger and full-time students predominate. As part of a broad effort that began in the late 1960s to increase and diversify access, policies to encourage student flow have included improving student preparation for college, making financial aid available and portable, improving outreach and articulation within and across educational sectors, and rationalizing requirements for college admission and transfer.