Psychological Assessment of High Ability: worldwide‐used Wechsler's intelligence scales and their psychometric shortcomings

Because the psychological assessment of high ability usually concentrates on intelligence testing, it is pertinent to discuss the validity of intelligence test batteries. The well‐known Wechsler's scales are analyzed and evaluated. Based on psychometric models, especially the Rasch model, analyses are made of some German editions, which show that hardly a single subtest scores fairly. That is, the true extent of testees’ abilities will not be correctly represented by the scores obtained under current scoring rules. Since many of the items of the analyzed editions correspond to items of the American edition (WISC‐R), the same shortcomings must also be suspect for that test battery. In this light, the administration of these tests is no longer acceptable. However, it is shown that Wechsler's basic concept is worthwhile when accompanied by (modern) psychometric tools: a new (German) test battery, AID, is introduced which, in particular, conforms to economic requirements if high ability is to be assessed.