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Internationally, there has been growing commitment to bilingual education among policymakers, educators, and researchers. Bilingualism and biliteracy are not uncommon, as more than half the world’s population speaks and learns to read more than one language. Growing globalization in commerce and immigration have motivated countries across the globe to adopt policies promoting bilingual education. Bilingual education reflects any curriculum that strategically uses two or more languages in instruction. These programs reflect one of two primary goals: supporting language-minority students in the acquisition of language, literacy skills, and academic content in the dominant language of the community; or enabling students to develop language, literacy, and academic skills in an additional language. Although most programs serving language-minority students are subtractive in nature, using the home language to serve language and academic achievement in the majority language, dual-language immersion programs are growing in popularity. Dual-language immersion programs and immersion programs serving language-majority students reflect additive approaches to bilingual education, and their students have been found to perform as well as or better than their monolingual peers. Becoming biliterate requires students to develop skill in engaging with and making sense of texts in two languages that vary both orally and in their writing systems. Developing word-level and text-level skills in two languages involves a common set of cognitive processes that may transfer across languages. Instructional practices promoting language, literacy, and academic achievement in both languages include high-quality literacy instruction, translanguaging within classrooms, content-based instruction, and fostering responsive classroom climates that value linguistically diverse students and their home cultures.

From the 1960s to the early 21st century, different terms have arisen in diverse research traditions and educational contexts where teachers and researchers are interested in exploring and researching ways of helping learners to learn both language and content at the same time. These terms include content-based instruction (CBI), immersion, sheltered instruction, language across the curriculum (LAC), writing across the curriculum (WAC), and content and language integrated learning (CLIL). Common to all these traditions, however, is the monoglossic and monolingual assumption about academic language and literacy. The dynamic process turn in applied linguistics has changed our view of the nature of language, languaging, and language learning processes. These new theoretical insights led to a transformation of research on LAC toward research on academic languages and literacies in the disciplines. A paradigm shift from monoglossic to heteroglossic assumptions is also particularly important in English-as-an-additional-language (EAL) contexts.