This is a really great book. I've got an older edition and it was uncanny how spot-on the author was about the types of personalities and characteristics that different people have based on birth order. I even tested it out for a psych project I did to see how accurate it was. It proved to be pretty true. It was very fascinating--especially when the author goes into the different things that influence your "birth order", such as if there was a large gap between children, if you were the first boy or girl (even if you were a middle child), the traits of youngest, middle, and older children and what kind of jobs they might be good at, stuff like that. Great subject!!!