The book provides a review of scientific research on the learning outcomes of students with limited or no proficiency in English in U.S. schools. Research on students in kindergarten to grade 12 is reviewed. The primary chapters of the book focus on these students' acquisition of oral language skills in English, their development of literacy (reading & writing) skills in English, instructional issues in teaching literacy, and achievement in academic domains (i.e., mathematics, science, and reading). The reviews and analyses of the research are relatively technical with a focus on research quality, design characteristics, and statistical analyses. The book provides a set of summary tables that give details about each study, including full references, characteristics of the students in the research, assessment tools and procedures, and results. A concluding chapter summarizes the major issues discussed and makes recommendations about particular areas that need further research.