The document discusses strategies for building background knowledge for English language learners. It begins with an activity where participants try to determine the meanings of educational acronyms. It then outlines the objectives of observing a modeled sheltered instruction lesson, discussing how lack of background knowledge challenges students, and learning methods for assessing prior knowledge and building student background. Specific strategies are presented for assessing background knowledge, providing information to fill knowledge gaps, and explicitly linking new concepts to past learning. The document encourages participants to brainstorm ways to incorporate building background into their own lessons.