<Li> Wechsler argued that the Binet scale items were not valid for adult test - takers because the items were chosen specifically for use with children . </Li> <Li> The "Binet scale's emphasis on speed, with timed tasks scattered throughout the scale, tended to unduly handicap older adults ." </Li> <Li> Wechsler believed that "mental age norms clearly did not apply to adults ." </Li> <Li> Wechsler criticized the then existing Binet scale because "it did not consider that intellectual performance could deteriorate as a person grew older ." </Li>

What does wais stand for and what are its two sub-scales