Intellectual Disability. A student with an intellectual disability displays significantly sub-average general intellectual functioning, coexisting with deficits in adaptive behavior, that adversely affects the student’s educational performance.18 The student’s sub-average general intellectual functioning and coexistent deficits in adaptive behavior typically manifest during the student’s developmental period. A student with an intellectual disability is one who: • has been determined to have significantly sub-average intellectual functioning as measured by a standardized, individually administered test of cognitive ability in which the overall test score is at least two standard deviations below the mean, when taking into consideration the standard error of measurement of the test; and 14 Letter to Anonymous (OSEP 8/11/1989) 15 Letter to ▇▇▇ (OSEP 9/14/1999) 16 Letter to ▇▇▇▇▇▇▇ (OSEP 4/5/1989)
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Sources: Interlocal Agreement
Intellectual Disability. A student with an intellectual disability displays significantly sub-average general intellectual functioning, coexisting with deficits in adaptive behavior, that adversely affects the student’s educational performance.18 performance.1 The student’s sub-average general intellectual functioning and coexistent deficits in adaptive behavior typically manifest during the student’s developmental period. A student with an intellectual disability is one who: • has been determined to have significantly sub-average intellectual functioning as measured by a standardized, individually administered test of cognitive ability in which the overall test score is at least two standard deviations below the mean, when taking into consideration the standard error of measurement of the test; and 14 Letter to Anonymous (OSEP 8/11/1989) 15 Letter to ▇▇▇ (OSEP 9/14/1999) 16 Letter to ▇▇▇▇▇▇▇ (OSEP 4/5/1989)and
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