[9급 국가직 영어 2015년 15번]

The WAIS-R is made up of eleven subtests, or scales. The subtests of the WAIS-R are arranged by the type of ability or skill being tested. The subtests are organized into two categories. Six subtests define the verbal scale, and five subtests constitute a performance scale. We can compute three scores: a verbal score, a performance score, and a total (or full-scale) score. The total score can be taken as an approximation of general intellectual ability. To administer the WAIS-R, you present each of the eleven subtests to your subject. The items within each subtest are arranged in order of difficulty. You start with relatively easy items, and then you progress to more difficult ones. You stop administering any one subtest when your subject fails a specified number of items in a row. You alternate between verbal and performance subtests. The whole process takes up to an hour and a half.