--Definition+of+Cognitive+Disabilities+(CD)

(b) The IEP team may identify a child as having a cognitive disability if the child meets the criteria under subd. 1.a. or b., 2. and 3.a. or b. as follows: 1. a. The child has a standard score of 2 or more standard deviations below the mean on at least one individually administered intelligence test developed to assess intellectual functioning. b. The child has a standard score between 1 and 2 standard deviations below the mean on at least one individually administered intelligence test, the child has been documented as having a cognitive disability in the past, and the child’s condition is expected to last indefinitely.
 * (1)** COGNITIVE DISABILITY. (a) Cognitive disability means significantly sub-average intellectual functioning that exists concurrently with deficits in adaptive behavior and that adversely affects educational performance.