George, yes, that is the thinking. You would only be able to apply extended norms to the single subtest with a 19. The maximum scaled score possible, even with extended norms, would be 28. This might have a moderate effect on the index score in question, but a negligible effect on the FSIQ. The trade-offs with switching to the extended norms, which were developed from a fairly small norm group of HG+ children (versus the standard norms, based on thousands of data points), are not worth the relatively small improvement in spreading the curve.

...pronounced like the long vowel and first letter of the alphabet...