Every math teacher should read this book, which describes the biggest and best change I've ever made in my teaching! I was stuck in the rut of direct instruction for 30 years, which I now realize did not require my students to think very much as they copied notes and mimicked my methods. Now I have the tools I need to get them thinking for themselves about math, and I feel like my classes, which were half-asleep before, have come alive! Thank you, Peter, for teaching me a better way!