The GAI will gave a better understanding of his abilities, where the FSIQ can be pulled down by the lower processing speed or working memory. This link shows how to calculate the GAI from his subtest scores.

http://www.pearsonassessments.com/N...DA-05888C7CC082/0/80720_WISCIV_Hr_r4.pdf

Also, check this link for a good explanation as to why the GAI is a better measurement for gifted kids: http://www.nagc.org/index.aspx?id=2455

I'm curious - do you mind sharing his CogAT scores? I am having the same problems with access to HC for my dd9. I have heard anecdotal evidence that the CogAT can be an unreliable test, but I am still looking for hard evidence!

-Tricia