I always find it interesting for someone to spend a few years (less than 5) as a teacher, then decide to become a motivational speaker for teachers. The author used techniques with one or two classes, and decided that, since it worked for him, it will work for everyone. His ideas would hold more water if he had tried them with multiple classes (like Rafe Esquith, who has taught for over 20 years). This seems more like an advertisement for how great Ron Clark is than how you can be a better teacher.