Among the criteria to qualify for a diagnosis of Reading Disorder, Mathematics Disorder or Disorder of Written Expression, specified in the Diagnostic and Statistical Manual of Mental Disorders - IV (DSM-IV) an individual’s achievement, as measured by individually administered standardized tests, must be substantially below that expected for the person’s age, measured intelligence, and age-appropriate education. In addition, the difficulty must interfere significantly with academic achievement or activities of daily living requiring reading, math, or written expression abilities.