While some of the modifications made to produce the WAIS–III and WMS–III (Wechsler, 1997a, 1997b) make sense from a neuropsychological standpoint, there are many questions still unanswered about the validity and reliability of these tests and their ultimate utility to neuropsychologists. The new tests have been criticized for having long administration times, which is problematic given pressures to decrease rather than increase the length and cost of neuropsychological evaluations (Ryan et al., 1998). Clinical neuropsychologists want to know if these tests can help them evaluate their patients more accurately with greater sensitivity and specificity than the alternatives, and experimental neuropsychologists want to know if they can help answer theoretical questions.