This was an excellent and very readable book. As a post-graduate teacher certification candidate in a professional development school program I've seen a number of approaches to classroom management. Most teachers, including my wife, use a combination of Mr Kohn's collaboration, content and choice, mixed with some extrinsic rewards. These rewards do not have to be expensive, and many, like pencils, are also very useful to the students. What a teacher will do in the classroom depends on the age and grade level of the students and the individual's teaching style. This book was the first really effective and well-documented presentation of the position that "bribes" are counter-productive.