Anonymous wrote:trust it for what? To show akid's I.Q.? And what does that prove exactly. I thought this was the AAPprogram. I.Q. alone doesn't prove squiddly. Thankfully they take alot more than just that into consideration.
It's the county who made the decision to use WISC as one of the accepted tests. From the accuracy stand point, individual testing results are more accurate than group testing results or GBRS. This is imperfect selection process, ideally, all the accumulative results would reflect a child's true ability. But under certain circumstances where a child doesn't do well in a group test or didn't get a high score from his/her school, then at least a high WISC deserves another look.
weiging each individual testing/score, WISC definitely weighs more than CogAT or NNAT or GBRS.
If affordable, WISC/WJ (or other individual IQ/Achievement pair) would show a better picture than WISC alone. Keep in mind, CogAT is supposed to be an ability test, NNAT is definitely not achievement. So basically WISC tests something similar, just more in depth and more well-established thus more accurate.