The is the gold-standard individually administered clinical instrument for assessing the intellectual ability of adults aged 16:0 to 90:11 years. Published by Pearson (2008), it measures both general intelligence (IQ) and specific cognitive domains. It is not an online quiz or a free test—it requires extensive professional training to administer and interpret.

Nonverbal reasoning, spatial processing, and visual-motor integration. Block Design, Matrix Reasoning, Visual Puzzles Ability to hold and mentally manipulate information. Digit Span, Arithmetic Processing Speed (PSI) Efficiency and speed of mental and graphomotor processing. Symbol Search, Coding

The WAIS-IV is built around that combine to form the Full Scale IQ (FSIQ) , which represents overall cognitive ability: