This document discusses bilingual and multilingual education. It defines bilingual education as using the mother tongue for instruction throughout school while also teaching a second language as a subject. The purposes of bilingual education are to help learners learn about their own and other cultures, and to promote assimilation. The document outlines different frameworks for bilingual education, including language-based frames that examine language balance and additive/subtractive programs. It also discusses content-based frames like submersion, transitional bilingual, maintenance bilingual, immersion, community language teaching, and heritage language programs. Context-based frames examine macro contexts and micro contexts like elite and folk bilingualism. The document emphasizes integrating these frameworks and features of successful programs.