"Formative assessment--the process of interpretating data on student performance to adapt instruction to individual needs--is perhaps the single most powerful tool available to teachers to help every student succeed to their full potential." With that bold statement, Michael W. Connell sets out to unpack formative assessment--what it is, how it works, and why it is so essential for learner growth. He shows how to incorporate it into different teaching methods and settings, such as flipped classrooms, programmed instruction, and more. The goal: to provide the benefits of individualized instruction even in group settings.