Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
This is just what schools need so that problem behaviors aren't repeated! PBIS is great in theory; however, it often teaches students to behave simply because they will be rewarded for it. This book helps create a culture of accountability that every student is a part of, not a way to force compliance.