They also say:
Quote
Flanagan and Kaufman (2004), in Essentials of WISC-IV Assessment, deem the FSIQ �not interpretable� if Composite scores vary by 23 points (1.5 standard deviations) or more.
My DS12 just took the WISC-IV. His PSI came out ~40 points lower than the other three. I'm trying to figure out what that really means. Not much luck in finding anything I believe so far. The math is all pretty fuzzy.
(JZ)