We use the most recent and comprehensive tests as part of a cognitive or intelligence evaluation. Currently, the “gold standard” is the fourth edition of Wechsler Adult Intelligence Scale (WAIS – IV), released in 2008 by Pearson. The median Full Scale IQ is centered at 100, with a standard deviation of 15. In a normal distribution, the IQ range of one standard deviation above and below the mean (i.e., between 85 and 115) is where approximately 68% of all adults would fall. The WAIS-IV measure is appropriate for use with individuals aged 16-90 years. It measures verbal skills, perceptual reasoning skills, working memory, and processing speed.