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Reynolds Intellectual Assessment Scales (RIAS)

The RIAS is an individually administered test of intelligence appropriate for ages 3 to 94 years, which includes a conormed, supplemental measure of memory. The RIAS includes a two-subtest Verbal Intelligence Index (VIX) and a two-subtest Nonverbal Intelligence Index (NIX), that taken together form the Composite Intelligence Index (CIX). The CIX assesses overall intelligence or g, including the ability to reason, solve problems, and learn. The VIX assesses verbal intelligence by measuring verbal problem-solving and verbal reasoning where acquired knowledge and skills are important. The NIX assesses nonverbal intelligence by measuring reasoning and spatial ability using novel situations and stimuli that are predominantly nonverbal. Administration of the four intelligence subtests takes approximately 20 to 25 minutes.

A Composite Memory Index (CMX) is derived from the two supplementary memory subtests, Verbal Memory and Nonverbal Memory. The Verbal Memory subtest provides a basic, overall measure of short-term memory skills (e.g., working memory, short-term memory, learning) and measures recall in the verbal domain. The Nonverbal Memory subtest measures the ability to recall pictorial stimuli in both concrete and abstract dimensions. These short-term memory assessments require approximately 10 minutes of additional testing time. Administering the complete RIAS (all six subtests) typically takes about 35 minutes. It provides a thorough assessment of the client's current level of intellectual functioning and also allows the examiner to evaluate the relationship between the client's memory and cognitive skills.

The RIAS was normed on 2,438 individuals ages 3 to 94 years of age residing in 41 states, matched to the U.S. census data for age, gender, geographic region, ethnicity, and years of education completed. It has proven reliability (.90 to .95 for all six subtests and from .94 to .96 for the four Indexes) and validity with detailed evidence documented in the RIAS/RIST Professional Manual.