The Differential Ability Scales (DAS) is a nationally normed (in the US), and individually administered battery of cognitive and achievement tests.
[1] The diagnostic subtests measure a variety of cognitive abilities including verbal and visual working memory, immediate and delayed recall, visual recognition and matching, processing and naming speed, phonological processing, and understanding of basic number concepts.
[2] The original DAS was developed from the BAS British Ability Scales both by Colin D. Elliot and published by Harcourt Assessment in 1990.
There are also two optional diagnostic clusters — working memory and processing speed.
In addition there are up to nine diagnostic subtests for this age group that feed into three possible diagnostic cluster scores — working memory, processing speed and, for the youngest ages, school readiness.