Thank you all for your replies! Grinity - We haven't done any achievement testing. Do you think this is something that we should do now, or wait a little bit? I don't know much about this kind of testing! I have read before that if your child has many 17, 18 or 19 subset scores on the WPPSI, that they would probably get a higher score with the Stanford Binet L-M. Do you have any experience with this test? Is this something we should consider? Thank you again!