Table 1b.

Test measures of the WAIS and WAIS-R

Tests	Task descriptions	Test measures
Information Subtest	Task requiring answering questions about general factual knowledge	Information = Number of correct answers
Vocabulary Subtest	Task requiring defining words presented visually and orally, with higher quality answers yielding more points.	Vocabulary = Number of correct answers
Comprehension Subtest	Task requiring answering questions about general principles and social situations involving common sense. Answers of higher quality yield more points.	Comprehension = Number of correct answers
Similarities Subtest	Task requiring uncovering common concepts underlying pairs of words—higher abstraction yield more points	Similarities = Number of correct answers
Digit Span Subtest	Task requiring repeating a series of digits with increasing length, first forward, and then backward. One point is allocated for each successful trial.	Digit Span = Number of correct answers
Arithmetic Subtest	Task requiring mentally solving orally presented arithmetic problems within a time limit	Arithmetic = Number of correct answers each within a time limit
Picture Completion Subtest	Task requiring identifying missing details in a series of pictures (e.g., a slit in a screw) within a time limit	Picture Completion = Number of correct answers each within a time limit
Picture Arrangement Subtest	Task requiring arranging a set of pictures in order within a time limit so that they tell a sensible story	Picture Arrangement = Number of correct answers each within a time limit
Block Design Subtest	Task requiring arranging bi-color blocks as quickly as possible so that they form patterns similar to a presented picture	Block Design = Number of correct answers each within a time limit
Object Assembly Subtest	Task requiring assembling cut-up drawings of objects (puzzle-like) within a time limit	Object Assembly = Number of correct answers each within a time limit
Digit-Symbol Coding Subtest	Task requiring copying symbols paired with specific digits within a time limit	Digit-Symbol Coding = Number of symbols copied within a time limit

Note: WAIS = Wechsler Adult Intelligence Scales; WAIS-R = Wechsler Adult Intelligence Scales-Revised.