Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
This book is a true story of a little boy who had learning difficulties and :neither of his parent knew how to deal deal with him. He came to Cathy Glass's. It was a joy to read and Cathys patients and caring. A good read.