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I just picked two arbitrary numbers when I gave my example (should know better than to do that sort of thing - always gets me in trouble!).

I'll edit my previous post to make my point more correctly. Namely that the RPI scores can be more helpful than the SS scores when you're dealing with a 2E child. For example, from my son's recent testing, on writing fluency he got a SS of 89 (barely >-1 SD from the norm of 100 SD 10) but his RPI was 74/90 - defined as limited proficiency well below grade level. His Story recall - delayed was SS of 122 (>+2 SD) with RPI of 96/90. Clearly the lower score has more utility in the school setting than the higher score.

Part of what I was also trying (ineptly) to point out was that being a set distance from the norm in SS doesn't equate in a direct fashion to the RPI scores. In the one case my son's -11 SS equalled -16 RPI; in the second case my son's +22 SS equaled +6 RPI. This is because the WJ III does a transformation (on most reports this is listed as the W scale I believe) to the data that skews it depending on the subtest/cluster.

And getting a lower SS doesn't necessarily translate into a lower RPI. For example, his Math Fluency SS was 84 with RPI of 77/90. His Writing Fluency SS was 89 with RPI of 74/90. So a SS +5 higher translated into an RPI -3 lower.

If you use the WJ III recommendations, then my son's Math Fluency is within acceptable limits but his writing fluency is not (they use a cut off of 76/90 RPI). If you use the school's 1.5 SD discrepancy formula on his SS's then his Math fluency score of 84 qualifies him for services but his Writing fluency score of 89 does not.

This is rather crazy making for those of us with 2E kids.