The CogAT supposedly tests nonverbal and verbal reasoning ability, same as the GAI of the WISC, so I'm not sure why a district would insist upon using data from working memory or processing speed.
The problem is that the CogAT really does place a premium on processing speed and working memory. To do well on the CogAT, you need to be *fast* and for some of the subtests, you need to be able to hold several things in mind if you are going to be quick. Frankly, I think the CogAT is more about processing speed and working memory than what it purports to test.
