Please correct me if I am wrong here because I have not ordered the book yet.
I seem to recall looking at an on-line preview of Exceptionally Gifted Children where Miraca Gross displayed a chart which specifically annotated the age at which each of her study subjects first walked independently. As I said, this was a �look inside� option, so I don�t know the full context but it seemed that the gist of it was that most of her subjects walked independently (much) earlier than usual. I was surprised to see this information because I thought the consensus of experts no longer believe there is any correlation between early walking and IQ.
I don�t believe even Dr. Ruf uses that milestone in her levels.
Data (test scores) are important snap-shots of performance. However, instruction can also enhance performance on these measures, especially multiple choice achievement tests. I think there is more to determining intellectual ability than just a test score or only early milestones.
