This book has many good points. It seems that he uses a lot of logic a studies that has been found in the book. This is a great different approach because usually you would use statistics that doesn't involved with psychology, but the author is manage to use statistics and explain from there. Thumbs Up!
The author's thesis is that intelligence and reasoning skills are learned. Intelligence is not fixed, inherent, or determined by genetics, but is greatly influenced by one's environment. Thus, the correlation between high soci0-economic status and high test scores. The author backs it up with much good research. It's an important book that can be used to help society!