DS6 took WPPSI at 5:3. There are two disadvantages the way I see it - ceiling issues and the fact that you have to score higher on WPPSI than SB-V to get to DYS. We needed the results at that point and didn't want to wait for another 9 months for WISC. To our big surprise he made the DYS cutoff.

We will most likely use the same test for DS4 once he turns 5. If it doesn't work (bad day, not co-operating, wrong test for him) we can always try WISC a year later.

LMom