The document discusses different program models and instructional approaches for teaching English Language Learners (ELLs). It describes bilingual education programs like transitional bilingual education and dual language immersion that teach some content in the native language initially. It also outlines sheltered instruction, an approach where content is taught in English but made comprehensible for ELLs. The Sheltered Instruction Observation Protocol (SIOP) provides guidance on lesson preparation and delivery techniques to support ELLs in sheltered classes.