The measure underwent a revision in 1997 (WMS-III). The WMS-R de-emphasized the overall MQ score and focused on verbal–visual and immediate–delayed comparisons. The first revision occurred in 1987 (WMS-R) and offered an improved normative sample, the inclusion of four additional index scores, and the introduction of additional subtests. The original WMS included seven subtests that were combined to compute an overall Memory Quotient (MQ). A number of the original subtests were adapted from existing batteries, such as the Binet–Simon Scale and the Wells and Martin battery however, Wechsler combined the existing methods for evaluating memory with normative data that allowed for meaningful interpretation of test scores. The WMS (1945) was developed by David Wechsler to serve as a clinical test to detect and evaluate memory disorders.
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