As much as we might like to think that IQ scores are stable, I really don't think that the data supports that and the younger the tester, the less stable the results. Granted, a child who tests HG as a young age is likely to still test gifted later, but is not likely to test as high on a second testing at an older age.
This article deals with group ability tests, not IQ, but addresses that general idea:
http://faculty.education.uiowa.edu/dlohman/pdf/Gifted_Today.pdfThis is probably totally irrelevant to the original question, but I am just finding that the assumptions I've had in the past may be inaccurate and sharing ...
