The extended norms should only be used (I am not an expert but got this information from one) if the full scale IQ score exceeds 130 and the GAI exceeds 140 AND the child receives at least an 18 on two subtests. I know there has been some confusion about this so just repeating what I was told. The way it was explained is that it is only when you deal with children in the very upper ranges that the regular norming sample is not sufficient.

Last edited by psychland; 03/07/14 07:18 AM.