This comprehensive account of bilingualism examines the importance of using students native languages as a tool for supporting higher levels of learning. The authors highlight the social, linguistic, neuro-cognitive, and academic advantages of bilingualism, as well as the challenges faced by English language learners and their teachers in schools across the United States. They describe effective strategies for using native languages, even when the teacher lacks proficiency in that language. This resource addresses both the latest research and theory on native language instruction, along with its practical application (the what, the why, and how) in K8 classrooms.