tortuga, my children have had the WISC but not the WIAT so I am not familiar with WISC/WIAT combo scoring or how the prediction is made. My kids have had the combination of WJ-III Cognitive + Abilities tests, which also gives a predicted measure, and with that battery the predictions are made based on different combinations of individual cognitive subtests compared against broad reading/math/writing etc achievement subtests. I suspect the same is true for the WISC/WIAT combo, and that may give a clue to why your dd's scores are "predicted" at the level they are. So basically what you want to find out (which you might find on either your dd's report or by googling or by finding someone here who's familiar with WISC/WIAT combo reporting) is which ability+achievement subtest scores went into each prediction. Once you know that there are several things to consider: is there scatter in any of the subtests, particularly on the ability testing? How/in what order is each subtest score administered? Was the WISC given before the WIAT? Is it possible that any of the testing either isn't reflective of your dd's true ability (I'm referring to *under* estimating), or is it possible that whatever caused the lower processing speed score also impacted other scores on the WISC?

The other thing I'd consider is that an FSIQ of 134 is a really high FSIQ (not DYS level, but it's greater than 98th percentile). If she has a lower processing speed, I'm guessing that looking at her GAI (takes wm and processing speed out of the calculation) might be > 99th percentile. The WIAT scores your dd have are 99th percentile except for reading which is > 98th (I think... I am actually guessing the WIAT percentiles so I might be incorrect)... so when you look at the scores from that perspective, the achievement scores seem to make sense. What doesn't fully make sense to me is why are her predicted scores lower (which is different than wondering why her actual scores are so high). Again, I suspect that the key lies in understanding what her subtest scores are and which subtests go into the "prediction" calculation.

Can you ask your dd's tester what his/her impression is re why the actual results vs predicted are different?

Best wishes,

polarbear