The Revised Illinois Test of Psycholinguistic Abilities is an individually administered test for children aged 4-8 years, measuring 12 functions employed in the acquisition and use of language.

Scoring: The test consists of 10 main subtests (Auditory Reception, Visual Reception, Auditory Association, Visual Association, Verbal Expression, Manual Expression, Grammatic Closure, Visual Closure, Auditory Sequential Memory, and Visual Sequential Memory) and two supplementary subtests (Auditory Closure and Sound Blending). Raw scores for each subtest are used to derive Scaled Scores for each subtest, a Composite Score, Psycholinguistic Age Scores for subtests and Composite, and Psycholinguistic Quotients for subtests and Composite. The book entitled Psycholinguistic Learning Disabilities: Diagnosis and Remediation, by Samuel A. Kirk and Winifred D. Kirk is offered in the testing library as a supplement to those using this test.

Reliability: Internal consistency coefficients range from .60-.96, with a median of .88, except for one coefficient of .45 for Sound Blending for the age level 8.7-9.1. High internal consistency was confirmed (range .63-.93) for a group of educable mentally retarded children. Internal consistency coefficients for difference scores among the Illinois Test of Psycholinguistic Abilities subtests range from .67-.91 with a median of .81. Five-month test-retest coefficients for 4-, 6-, and 8-year-old children ranged from .28-.90 with a median of .71 for subtests, .87-.93 for Composite scores, and .86-.91 for Psycholinguistic Quotients.

Validity: Several studies have obtained correlations between Illinois Test of Psycholinguistic Abilities scores and intelligence measures. Paraskevopoulos and Kirk report significant correlations of Illinois Test of Psycholinguistic Abilities Composite scores and Psycholinguistic Quotients with Stanford-Binet Mental Age, IQ, and Vocabulary scores across several age levels (standardization data). Huizinga tested 100 six-year-old children and found Illinois Test of Psycholinguistic Abilities Total Scaled Scores correlated significantly with Stanford-Binet IQ (.88), as well as WISC Verbal, Performance, and Full Scale IQS (.75, .58 and .80). Guest obtained significant correlations for Illinois Test of Psycholinguistic Abilities Total Score with Wechsler Preschool and Primary Scale of Intelligence Verbal, Performance, and Full Scale IQS (.69, .47, and .67) for 47 kindergarten children. Wechsler Full Scale IQ was significantly correlated with Illinois Test of Psycholinguistic Abilities Total scores (.61) for 73 third-grade children (Bartin, 1971) and with Illinois Test of Psycholinguistic Abilities Psycholinguistic Quotients (.87) for 136 children aged 4-10 years.