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"Free college" programs are widespread in American higher education. They are discussed as addressing college access, affordability, inequality, and skills shortages. Many are last-dollar tuition guarantees restricted to use at single community colleges. Using student-level data spanning the transition to college, we investigate how two similar local community college tuition guarantees in Pennsylvania affected college-going outcomes. The Morgan Success Scholarship has large impacts on community college attendance and associate degree attainment. The program diverts students away from four-year colleges, though much of this effect is temporary. Meanwhile, we find little evidence that the Community College of Philadelphia's 50th Anniversary Scholars program has any impact on college-going behavior. We suggest reasons for divergent findings and offer suggestions for practice.

Promise programs are discussed as a policy movement that began with the 2005 launch of the Kalamazoo Promise. Since then, programs bearing the Promise label or sharing similar features have spread across the higher educational landscape, appearing in most states and across postsecondary sectors. Simultaneously, scholarly literature discussing these programs has burgeoned. And yet, scholars and others are unable to formulate a clear conception of what a Promise program is and what if anything sets such a program apart from other scholarship programs (e.g., state need-based grants). In this paper, we examine how scholars have discussed these programs over time. We begin with the initial theorization of the Kalamazoo Promise as a case and observe its use as a prototype in the formulation of a general model once "Promise program" was established as a category. We follow how the spread and transformation of "Promise programs" was reflected in repeated partial reconceptualization. We find three competing conceptual models emerging in sequence: 1) a thick, place-based causal model derived as a generalization of the Kalamazoo Promise, 2) a thin empirical model crafted in the aftermath of the launch of the Tennessee Promise, and 3) a partially acknowledged minimal or symbolic model advanced haltingly in response to critiques of last-dollar community college state programs. Scholarly conceptualization is largely reactive to empirical program diffusion and transformation, though scholarly idealization may have played a role in this diffusion itself.

"Free college" (sometimes called Promise) programs are common in U.S. higher education. Reviewing 88 studies of 25 state and local programs, I provide a nuanced picture of the mechanisms through which these programs may work and their likely effects on students, communities, and colleges. Some commonly-claimed mechanisms for these effects--e.g., improving secondary school environments or impacting residential decisions--lack empirical support or are implausible for most existing programs. Programs are consistently found to shift college-bound students to colleges where they can use more scholarship dollars, increase enrollment at eligible colleges, and (for generous local programs only) increase community school district enrollment. Less consistently, programs boost college participation and thereby degree attainment, but evidence for direct effects on college performance, persistence or completion net of enrollment is weak. There is insufficient or inconsistent evidence for program effects on secondary school performance and graduation, post-college income and debt, community population or property values, and inequality reduction according to gender, race, or socioeconomic status.