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Bilingual education, broadly defined as instruction delivered in two languages, encompasses a range of program models with different goals, structures, and student populations. These include transitional programs that use students' home language as a bridge while developing English proficiency, maintenance programs that develop both languages to high levels, and dual language immersion programs that teach both languages to students from different linguistic backgrounds simultaneously. The research evidence on these programs is considerably more positive than the political controversies that have surrounded them for decades suggest. The political history of bilingual education in the United States is contentious. California voters passed Proposition 227 in 1998, restricting bilingual education and requiring English immersion for English learners. Arizona passed a similar measure in 2000. These measures reflected political backlash against bilingual programs and concerns, sometimes expressed in racially charged terms, about the pace of English acquisition. California voters reversed course in 2016, passing Proposition 58, which restored local flexibility to implement bilingual programs. The swings of policy across states have created natural experiments that researchers have used to study program effectiveness. Research on English learner education consistently shows that well-implemented bilingual programs produce stronger long-term outcomes for English learners than English-only programs. The strongest evidence comes from longitudinal studies that follow students through multiple years of school. Students in bilingual programs typically take longer to reach English proficiency but ultimately achieve higher levels of both academic English and content knowledge than those in English-only immersion programs. The early investment in building literacy and content knowledge in the home language pays dividends in English academic achievement. The linguistic interdependence hypothesis, developed by Jim Cummins, provides the theoretical foundation for predicting these outcomes. The hypothesis proposes that academic skills and underlying conceptual knowledge transfer across languages, so that students who develop strong literacy and academic skills in one language can transfer those skills to a second language more easily than students who lack this foundation. This predicts that building strong academic skills in students' home languages supports English academic development rather than competing with it. Dual language immersion programs, which integrate English-speaking students and students from other language backgrounds in programs that teach content in both languages, have shown particularly strong research support. Research documents that by the upper elementary grades, native English speakers in dual language programs match or exceed the achievement of comparison students in English-only programs, while their non-English-speaking peers show stronger English outcomes than comparable students in English-only programs. Both populations also develop meaningful proficiency in the second language. The cognitive benefits of bilingualism have been extensively studied. Research has documented advantages for bilinguals on measures of executive function, including the ability to control attention and switch between tasks, compared to monolinguals. The mechanisms proposed include that managing two languages requires regular inhibition of the non-target language, which exercises executive control systems. The bilingual executive function advantage is more consistently documented in some research paradigms than others, and its magnitude and generality continue to be studied. Heritage language learners, who have some exposure to a language other than English at home but may have limited formal literacy in that language, represent a distinct population with distinctive instructional needs. Heritage language programs that develop academic literacy in students' heritage languages alongside English show benefits for language maintenance and academic identity that support long-term academic engagement. Political debates about bilingual education often focus on whether non-English languages should be used in schools at all, a question that the research does not support. The research question is which specific program designs most effectively develop both English proficiency and academic achievement. The answer consistently points to programs that use students' home languages as resources for learning rather than treating them as obstacles to English acquisition.

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''Originally published June 3, 2024 on [https://docmoates.com/blog/bilingual-education-research-on-language-learning-and-academic-achievement/ docmoates.com].''