subtests and their abilities... what does the VCI and PSI control?
The VCI (Verbal Comprehension Index) and PSI (Processing Speed Index) do not control anything per se, rather they may provide insight or indication of abilities. Official information from the test publisher, provided to testers, may be copyrighted but there is good information made available free to the public on the test publisher's website and also on Wikipedia. As to exact correlation (especially how these scores would translate into classroom instruction), readers may be seeking answers which do not exist (or which I do not have) as IQ tests provide just one piece of data on an individual's intellectual profile.
