The current version is the fourth edition (WMS-IV) which was published in 2009 and which was designed to be used with the WAIS-IV.
This may include conditions such as dementias or mild learning difficulties.
[2] There is clear evidence that the WMS differentiates clinical groups (such as those with dementias or neurological disorders) from those with normal memory functioning and that the primary index scores can distinguish among the memory-impaired clinical groups.
[3] The original WMS was published by The Psychological Corporation (later acquired by Pearson), first in 1945, with revisions in 1987, 1997, and 2009.
This resulted in a representative normative sample of 1,400 adults (between the ages of 16 and 90) who completed both scales.