This article utilizes mixed methods—a lottery-based experimental design supplemented by qualitative data—to examine college readiness within an innovative high school setting: early college high schools. Early colleges are small schools that merge the high school and college experiences and are targeted at students underrepresented in college. Results show that early college students are more likely to have successfully completed the courses they need for entrance into college; early college students also graduated from high school at a higher rate. Interview and survey data show that early college students are generally considered similarly prepared to more traditional postsecondary students. The interview data also provide detailed descriptions of the kinds of strategies the schools use to support college readiness. The article concludes with lessons learned for secondary school principals.

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Randomized controlled trials (RCTs) in education are common as the design allows for an unbiased estimate of the overall impact of a program. As more RCTs are completed, researchers are also noting that an overall average impact may mask substantial variation across sites or groups of individuals. Mixed methods can provide insight and help in unpacking some of the reasons for these variations in impact. This article contributes to the field of mixed methods research by integrating mixed methods into a recently developed conceptual framework for understanding variations in impact. We model the use of this approach within the context of an RCT for online courses that found differences in impact across courses.

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