Wechsler Individual Achievement Test® | Fourth Edition (WIAT-4) is an individually administered achievement test for use in a variety of clinical, education, and research settings.

Wechsler Individual Achievement Test® | Third Edition (WIAT®-III) is an individually administered achievement test for use in a variety of clinical, educational, and research settings.

WIAT-4 Dyslexia Index Scores are brief, individually-administered, performance-based screening tools that provide risk assessment, strength of risk, and interpretive information for team and parent/caregiver communication regarding individuals who may have dyslexia.