The Leiter-3 evaluates nonverbal cognitive, attentional and neuropsychological abilities, and targets ‘typical’ as well as “atypical” children, adolescents, and now adults. Its engaging, nonverbal format makes it ideal for use with individuals with Autism and Speech/Language Disorders, as well as those who do not speak English. It provides an IQ score, as well as percentile and age-equivalent scores for each subtest.
The Leiter-3 has retained the best of the widely-used Leiter-R subtests, and includes a number of new measures. It now uses a refined block-and-frame format, plus foam manipulatives, for easier manipulation by all subjects. Completely nonverbal, the Leiter-3 maintains an easy, game-like administration throughout the test, which holds interest for a wide range of ages and clinical groups.
Overall efficiency and utility of the Leiter-3 has been increased by combining Leiter-R subtests, and removing items with similar difficulty levels, based on Leiter-R data. Through this process, the number of subtests has been reduced from 20 to 10. The streamlined Leiter-3 provides improved assessment of Fluid Reasoning and Attention/Memory.