Page "Wechsler Intelligence Scale for Children" Paragraph 31

The empirical consensus is that the WISC is best used as a tool to evaluate intelligence and not to diagnose ADHD or learning disabled children.

It can be used to show discrepancies between a child's intelligence and his / her performance at school ( and it is this discrepancy that School Psychologists look for when using this test ).

In a clinical setting, learning disabilities are generally diagnosed through a comparison of intelligence scores and scores on an achievement test, such as the Woodcock Johnson III or Wechsler Individual Achievement Test II.

If a child's achievement is below what would be expected given their level of intellectual functioning ( as derived from an IQ test such as the WISC-IV ), then a learning disability may be present.