Wechsler Individual Achievement Test®-Second Edition (WIAT®-II): WIAT-II tests an individual's achievement skills and allows the clinician to assess problem-solving abilities by evaluating the process as well as the product. The test is a comprehensive yet flexible measurement tool useful for achievement skills assessment, learning disability diagnosis, special education placement, curriculum planning, and clinical appraisal for preschool children through adults. New norms also allow for the evaluation of and academic planning for college students with learning disabilities.