The relative difficulty of the logical memory passages on WMS-1, WMS-2, and WMS-R were investigated in different orders of presentation within and between test forms. No evidence of order effects on difficulty level was obtained though, as expected, the second passage on WMS-1 was the most difficult over all orders. The first passages on WMS-1 and WMS-2 and both passages on WMS-R appear to be of equivalent difficulty.
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David Ivison (1993) studied this question.
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