Jennifer L. Steele, Robert Slater, Gema Zamarro, Trey Miller, Jennifer J. Li, Susan Burkhauser, Michael Bacon. Dual-Language Immersion Programs Raise Student Achievement in English (2017). Rand Corporation Research Brief.
English learners assigned to dual language immersion were morelikely than their peers to be classified as English proficient by grade 6. This effect was mostly attributed to English learner students whose native language matched the classroom partner language.