The  WISC is used not only as an intelligence test, but as a clinical tool. Some  practitioners use the WISC as part of an assessment to diagnose attention-deficit hyperactivity  disorder (ADHD) andlearning disabilities,  for example. This is usually done through a process called pattern  analysis, in which the various subtests' scores are compared to one another  (ipsative scoring) and clusters of unusually low scores in relation  to the others are searched for. David Wechsler himself suggested this in 1958.^[1]