The Council of Chief State School Officers (CCSSO), through the Immigrant Students and Secondary School Reform project, seeks to strengthen the capacity of state education agencies and districts to improve delivery of educational services to English language learners (ELLs) enrolled in high schools undergoing reform. This compendium was developed as one of the means to achieving this objective. This document highlights research and programs in the education of English language learners (ELLs), based on the work of the Immigrant Students in Secondary School Reform project. Recommendations for best practices in six areas crucial to the successful inclusion of ELLs in secondary school reform are presented. These areas are discussed in six sections of the compendium: (1) Immigrant Students with Limited Formal Schooling; (2) Academic Literacy; (3) Parent Involvement; (4) Summer Programs; (5) Professional Development; and (6) Special Education. This compendium attempts to bring the good work of bilingual/ESL educators and researchers into mainstream discussions of high school reform.