When some teachers think of differentiating instruction, they imagine having to create a different lesson for every student in the room. “That insanity is not what differentiation is all about,” says veteran teacher and author Larry Ferlazzo. But what exactly is it? And how can teachers do it (without losing their minds)? In this series of videos, Ferlazzo and his co-author Katie Hull Sypnieski, also a veteran teacher, explain what it means to differentiate instruction, provide tips for doing so with English-language learners, and detail the questions they ask themselves when planning a lesson for students of all levels.