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Leiter International Performance Scale-3 (Leiter-3)
For more information on this scale please follow this link: Leiter International Performance Scale-3.
Supplemental: Cerebral Palsy (CP) and Mitochondrial Disease (Mito)
Short Description of Instrument

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.

Comments/Special Instructions
Nonverbal administration and response.
Strengths/Weaknesses: Offers a completely nonverbal measure of intelligence that is ideal for use with those who are cognitively delayed, non-English speaking, hearing impaired, speech impaired, or on the autism spectrum
Psychometric Properties: The validity of a test may be judged in part by its correlation with other well-known tests of the same ability or capacity. It was possible to correlate the present scale with several other well-known tests of intelligence, both verbal and non-verbal.
Administration: 20-45 minutes. 3 to 75+ years
Leiter RG & Porteus SD. The Leiter International Performance Scale. Univ Hawaii Bull. 1936;XV(7):1-42.
Roid GH& Miller LJ. Leiter International Performance Scale-Revised. Wood Dale, IL: Stoelting; 1997.
Other References:
Arthur G. The Arthur adaptation of the Leiter international performance scale. J Clin Psychol. 1949;5(4):345-349.
Bessent TE. A note on the validity of the Leiter International Performance Scale. J Consul Psychol. 1950;14(3):234.


Document last updated July 2019