Well, the old SB-LM--which is not in regular use anymore--had a higher ceiling than the WISC and the SB-5. They top out at 160, and even with extended scoring (which has only come out in the past few years), I think it's still true that you literally cannot see scores of 180 or 200 now. Those high-high scores are impossible on the current tests.
145 is the DYS cutoff, which they consider to be PG, or "beyond the ability of tests to measure."
I like Dottie's term HG+ for that, since I don't think my DS8 is in the realm of some of the other DYS kids who really are amazingly PG. But he's clearly more GT than "just" HG (and I use the quotation marks not (incorrectly) for emphasis there, as so many people use them, but in the ironic sense).
If the range of GTness includes GT/MG/HG/EG/PG, where GT starts at 115-ish, and tests which are NOT made to test the tails of the Bell Curve anyway only go to 160, it's clear that the HG/EG/PG range is going to be tough to tell apart.
Last edited by Kriston; 02/23/10 03:02 PM. Reason: I'm kind of talking out of my hat about the top scores with the extended norms. We had DS8 tested before they were even doing them. How high can they go?
