What is the difference between WJ III Test of Cognitive Achievement and the WISC-IV?
Who is qualified to give the WJ III test? My son had the WISC done by the school psychologist and results were consistent with previous testing. Although requested, the school only did the WJ III Test of Achievement, not the Cognitive Test of Achievement. When questioned, the response was that the WISC was the same test. (I do not agree.) Also, the WJ III was administered by the school's speech pathologist. The examiner's credentials list: MS, CCC-SLP. Is this person qualified? The WJ III Test of Achievement results were lower than previous testing yet, the WISC IV was consistent with an increase in the full scale IQ. How can the WJ III Test of Achievement go down while the WISC IV goes up and the child has shown great improvement academically. He actually passed the MCAS tests in Massachusetts which are required to graduate high school. Any important information/opinions you can share with me? Thank you in advance.
Some clarifications:
The WISC is a test of intellectual ability (IQ)
The WJ-III Test of Cognitive Abilities is a test of intellectual ability (IQ)
The WJ-III Test of Academic Achievement is a test academic performance (not IQ)
As a school psychology doctoral student, I know that it would not be good to administer two IQ tests at the same time (it would be like giving two antibiotics that do the same thing at the same time, you would not be able to use the other one later on, as a backup).
IQ can change, slowly, and usually not dramatically.
Academic achievement can change a lot, in a relatively short period.
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Just wanted to add to my previous answer: Now that I am doing my internship at a site where they use cross-battery methods, my perspective on giving two IQ tests at the same time has changed somewhat. I do find it useful sometimes to use more than one instrument. The key is to have a reason for doing so, and knowing your instruments well.
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