I'd go with the extended norms on the WISC as well if they apply for a few reasons. Some of them I have mentioned on the other thread about the mom whose kiddo was just tested @ the GDC on both the WPPSI and the SB-LM. The other is, whatever one feels about the LM, it is a lot harder to use for advocacy b/c virtually no one takes it anymore for admission to programs, etc. unless they are completely unfamiliar with IQ tests. You won't be able to use it to apply to DYS, if that is a possibility either.
I can, sort of, see the point when we're talking about the current WPPSI which, I don't think, has extended norms, but in the case of the WISC-IV, and I assume the same will be true of the WISC-V, the extended norms exist. Even for the WPPSI, that won't be an issue soon anyway b/c the newer version should be on the market within months I believe and I'm pretty sure that Dr. Ruf and the GDC as well as others assisted in developing extended norms for that. I think that the same group helped with the development of extended norms for the WISC-IV as well so I'm not sure why they've clung to the LM either.
