He seemed to indicate that they were but it was because the parameters were not listed appropriately by the publishers of the WISC-IV, not necessarily because anyone was knowingly using them incorrectly. He did use them for DD (she met criteria) and as you said I am sure there are many other children on this board who meet this criteria. But if there is, for instance a VCI or PRI that is 99.9 but the other score is 97 percentile then extended norms should not be used even if the GAI is high enough, I am guessing that is probably when they are most often used incorrectly. I am guessing the maxing out of at least one subtest is only important because without doing so someone would have been excluded from the norming sample. I am far from a statistician but it was very obvious the psychologist explaining this to us was.
