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WPPSI III®
Random Thoughts
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The Picture Concepts tests is placed on the misnamed
Performance scale yet loads better on the Verbal scale.
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The misnamed Performance scale appears to be a measure
of Gv (visual spatial skill – Block Design), Gf (fluid reasoning – Matrix
Reasoning), and Gc (crystallized ability – Picture Concepts) possibly leading
to some problems with interpretation of results.
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The test allows for a bit of “IQ roulette” in that
there are 63 seven-subtest
combinations allowed in the computation of the overall FSIQ.
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The Matrix Reasoning test (item 25) has two correct
answers yet only one noted in the manual and on the record form.
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The General Language subtests seem to be measuring Gc,
like the other Verbal tests, and the isolation of them into a GL composite is
not very well explained.
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The computer software does not adequately indicate to
the user when substitutions are made.
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The computer software seems to only care about the 7
core subtests when it analyzes strengths and weaknesses (maybe it is too
overwhelmed by the 63 possible combinations).
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The manual provide a paucity of interpretive
information (actually none at all). Examiners are left to their own
background and knowledge in order to interpret the results. Maybe we have to
wait for the next round of books from the Psychological Corporation in order
to understand what this test is actually measuring.
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The Object Assembly, item #13, seems a bit odd. This is
the only OA item that we can recall in which an incomplete assembly results in
a perfect score. This is the only one in which an item, the tail, gets only
one correct juncture despite the fact that it touches two separate other
pieces. Leave the head, or either leg, or the tail off the final assembly and
the child still obtains maximum credit. Maybe the item should have been score
differently and in compliance with all other OA items.
For a further example
and explanation press this link.
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