This report from the Migration Policy Institute examines the increasing population of ELLs. It does this by examining the ELL population and developing a profile of ELL students, examining literacy achievement on both national and state math and reading assessments, and examining state identification, testing, and accommodation policies in the following states: California, Illinois, Colorado, and North Carolina.
Batalova, J., Fix, M., and Murray, J. (2007). Measures of Change: The Demography and Literacy of Adolescent English Learners. Migration Policy Institute, Carnegie Corporation of New York: New York, NY.