Funded through the US Department of Education’s highly competitive Investing in Innovation (i3) fund, IMPAQ international, in collaboration with Empirical Education Inc., and WestEd, is conducting a random assignment study to validate the Reading Apprenticeship model to adolescent literacy development. The Reading Apprenticeship framework combines affective and cognitive aspects of literacy support, promoting adolescents' engagement and achievement in reading and writing in their content area classes. The Reading Apprenticeship study is a school-level randomized trial aimed at evaluating the effects of the program in three content areas: English language arts, biology and US history, with a special focus on English language learners and low-income and minority students. The study involves 42 high schools in California and in Pennsylvania and looks at outcomes for teachers and students over a three-year period. Data collection includes: teacher, principal and student surveys; classroom and professional development observations; district student achievement records; and a student literacy assessment. IMPAQ is responsible for the overall scientific conduct of the study including development and implementation of the evaluation design, instrumentation, data collection, analysis and reporting.