The limitations of the Stanford-Binet caused David Wechsler to publish the Wechsler Adult Intelligence Scale (WAIS) in 1955. These two tests were split into two different ones for children. The WAIS-IV is the known current publication of the test for adults. The reason for this test was to score the individual and compare it to others of the same age group rather than to score by chronological age and mental age. The fixed average is 100 and the normal range is between 85 and 115. This is a standard currently used and is used in the Stanford-Binet test as well.