This document discusses the principles of differentiated instruction, which is a model of teaching that requires teachers to have flexible approaches to instruction to meet the varied needs of learners. It emphasizes that students differ in their background knowledge, readiness, interests, and learning preferences. The goals of differentiated instruction are to maximize student growth and individual success by providing instruction tailored to students' levels. Key strategies mentioned include flexible grouping of students, ongoing assessment to inform instruction, and varying content, processes, products, and learning environments based on student profiles.