I found her book to be too reliant on anecdotes to be really useful.

I was also annoyed by the huge amount of crossover in IQs and accomplishments among kids at different LOGs (eg, Level 3 and Level 5). I don't remember seeing much in the way of explanation about this problem, which made me more dubious about the book's value.

(Someone please correct me if she wrote up a discussion about how two people with the same IQ end up in very different LOG groups).

Val