This project studied the intercorrelations and long-term stabilities o
f standard Wechsler Adult Intelligence Scale-Revised (WAIS-R), Wechsle
r Memory Scale-Revised (WMS-R), and Auditory-Verbal Learning Test (AVL
T) summary indexes. It also reports similar data on the recently publi
shed Mayo Cognitive Factor Scales (MCFS), which are derivative indexes
for the combined administrations of these 3 tests. These analyses cha
llenge 2 assumptions that most psychologists make when interpreting ad
ult cognitive tests: (a) that for cognitively normal people, performan
ce in one cognitive domain correlates well with and predicts functioni
ng in other cognitive domains, and (b) that in the absence of patholog
y, cognition is stable.