Differential Ability Scales

The Differential Ability Scales (DAS) in the United States is a nationally normed, and individually administered battery of cognitive and achievement tests. It is comprised of a cognitive battery subdivided into two overlapping levels, a preschool level and school-age level, and a school achievement test that measures the basic skills in word reading, spelling and arithmetic. The range of the DAS covers children from 2 years and 6 months to 17 years and 11 months. The DAS was developed from the BAS British Ability Scales both by Collin D. Elliot and published by the Psychological Corporation in 1990.