Remediation is the most common policy designed to prepare students academically and socially during their early stages of college. But despite its profound importance and its significant costs, there is very little rigorous research analyzing its effectiveness. The goal of this paper is to provide a conceptual framework for evaluation of remedial education programs. Based on previous literature, we review a list of ingredients for successful interventions, present a number of approaches to remediation that make use of these ingredients, discuss alternative research designs for systematic evaluations, and enumerate basic data requirements. (Contains 19 footnotes.)