I have this edition and the one prior to this. Neither one is that useful. When I bought the 1st edition I thought it wasn't very helpful just because it was somewhat out of date, so went ahead and got this newer version hoping it would be more insightful. However, I am just as disappointed with this one as I was the first. I have a child who has this syndrome and had thought it would be a useful book to have on hand when my child has a new teacher, or a new baby sitter, or anyone else who is new in his life, but it really doesn't help much. It may in fact portray people with prader willi syndrome in a manner that is too negative, and provides little in the way of meaningful information re: helping or supporting the child or adult with prader willi syndrome. I am sorry I spent the money on it.