What is the RIAS-2? The Reynolds Intellectual Assessment Scales explained

The RIAS-2 (Reynolds Intellectual Assessment Scales, Second Edition) is an individually administered intelligence test published by PAR and written by psychologists Cecil R. Reynolds and Randy W. Kamphaus. It measures general intelligence in people ages 3 to 94 using a four-subtest core battery that yields verbal, nonverbal, and composite intelligence indexes, with optional memory and processing speed subtests. Its main selling points are speed and simplicity: the publisher reports that all eight subtests can be completed in under an hour, and the tasks place little demand on reading or fine motor skills. This article covers how the RIAS-2 is structured, how it is scored, who uses it, how it compares with the Wechsler scales, and what adults curious about their own IQ can do instead of booking a clinical appointment.

The heart of the RIAS-2 is a brief battery built to estimate "g", the general intelligence factor that underlies performance across many different mental tasks. According to PAR, the four core subtests provide a highly reliable estimate of g while deliberately avoiding tasks that depend on reading skill or quick hand movements.

The core battery contains two verbal and two nonverbal subtests:

• Guess What: the examiner reads a set of verbal clues and the examinee names the object or concept being described. This subtest draws on vocabulary and general knowledge.

• Verbal Reasoning: the examinee completes verbal analogies and relationships, a classic measure of reasoning with words.

• Odd-Item Out: the examinee views a set of pictures or figures and identifies the one that does not belong, a nonverbal reasoning task.

• What's Missing: the examinee looks at a picture and identifies the essential missing element, which requires visual analysis rather than verbal knowledge.

The two verbal subtests combine into the Verbal Intelligence Index (VIX), and the two nonverbal subtests combine into the Nonverbal Intelligence Index (NIX). Together they form the Composite Intelligence Index (CIX), the RIAS-2 equivalent of a full-scale IQ. PAR's interpretive materials note that the VIX serves as a reasonable approximation of "crystallized intelligence" (accumulated knowledge and verbal skill) while the NIX approximates "fluid intelligence" (reasoning through novel problems).

Beyond the core battery, the RIAS-2 includes four supplemental subtests. Verbal Memory and Nonverbal Memory combine into a Composite Memory Index (CMX), and two speeded tasks, the Speeded Naming Task and the Speeded Picture Search, combine into a Speeded Processing Index (SPI). The speeded processing subtests were new additions in the second edition, and the publisher notes they were designed to require minimal reliance on motor skills. Examiners can administer these supplemental measures when a referral question involves memory or slow processing, or skip them when a straightforward intelligence estimate is all that is needed.

The RIAS-2 also has a companion screener, the RIST-2 (Reynolds Intellectual Screening Test, Second Edition). The RIST-2 uses just two subtests from the battery, Guess What and Odd-Item Out, to produce a single composite score in about 10 to 15 minutes. According to PAR, the RIST-2 provides a valid estimate of g and serves as an indicator of risk for intellectual impairment, making it useful for deciding whether a fuller evaluation is warranted. In that role it competes with other brief measures such as the KBIT-2, which I have written about in an article on the KBIT test.

The current published versions are the RIAS-2 Normative Update (RIAS-2 NU) and RIST-2 Normative Update, which PAR released with a new "norm sample" (the reference group against which scores are compared) of 2,793 people based on 2023 U.S. Census data. The original RIAS-2 became available in 2016 with norms built on a sample of 2,154 individuals matched to 2012 Census proportions.

RIAS-2 index scores use the familiar IQ metric: each index is an age-corrected "standard score" scaled to a mean of 100 with a standard deviation of 15. A CIX of 100 sits exactly at the average for the examinee's age group, and about two thirds of people score between 85 and 115. Individual subtests are reported as "T scores", a scale with a mean of 50 and a standard deviation of 10.

The publisher's reporting materials also provide percentile ranks, 90% and 95% confidence intervals, z scores, normal curve equivalents, and stanines for the indexes. Confidence intervals matter because no test measures intelligence without error; a reported CIX of 112 is best read as a range of plausible scores rather than a single fixed number. The Normative Update added a Profile Validity Index, which flags unusual variability across an examinee's subtest scores compared with others the same age.

Scoring for the Normative Update runs through PARiConnect, PAR's online scoring platform, and the test can be administered from paper materials, a tablet-based digital record form, or (with modifications, and excluding the speeded subtests) by videoconference. The RIAS-2 is a C-level instrument, which means purchase and use are restricted to professionals with advanced training in psychological assessment.

The RIAS-2 shows up in schools, clinics, private practices, and neuropsychology settings. PAR lists identification of intellectual disability, learning disabilities, giftedness, memory impairment, and neuropsychological conditions among its applications, and the fact sheet specifically mentions school gifted and talented programs.

Two claimed advantages drive its popularity:

• Speed: the publisher lists 20 to 25 minutes for the core intelligence battery, 8 to 10 minutes for the memory subtests, and 8 to 10 minutes for speeded processing, so even the full eight-subtest battery fits inside an hour. When schools need to evaluate many children for gifted programs or re-evaluate students for special education eligibility, that time savings adds up.

• Low motor and reading demands: according to PAR, reduced dependence on reading and fine motor skills makes the RIAS-2 a more precise measure of g. A child with a motor impairment, or an older adult with arthritis or tremor, is not penalized for slow hands the way they can be on tasks that require rapidly assembling blocks or filling in symbols with a pencil.

The tradeoff is breadth. A four-subtest core samples fewer distinct abilities than a ten-subtest battery, so an examiner who needs a detailed profile of cognitive strengths and weaknesses may prefer a longer instrument or may supplement the RIAS-2 with other measures.

The Wechsler tests remain the most widely used clinical IQ measures, with the WISC covering children ages 6 to 16 and the WAIS covering adolescents and adults. Pearson lists the current WAIS-5 as suitable for ages 16 through 90 and reports about 45 minutes of testing for the seven-subtest full-scale IQ, or about 60 minutes for all ten primary subtests.

The practical differences come down to structure and philosophy. A single RIAS-2 kit spans ages 3 to 94, while the Wechsler approach splits that range across three separate instruments. The Wechsler scales build their full-scale IQ from a wider set of ability domains, including working memory and processing speed as standard components, which produces a richer profile at the cost of more testing time. The RIAS-2 treats memory and processing speed as optional add-ons and keeps its intelligence estimate focused on verbal and nonverbal reasoning. PAR reports strong correlations between RIAS-2 indexes and Wechsler scores, and the Normative Update gathered concurrent data with the WISC-V and WAIS-5, so the two families of tests clearly measure much of the same construct.

Neither approach is simply better. An evaluator who needs a defensible, efficient estimate of general intelligence often reaches for the RIAS-2; one who needs a fine-grained cognitive profile for a complex diagnostic question often prefers a Wechsler battery.

The RIAS-2 is a clinical tool. You cannot buy it, take it at home, or administer it to yourself, and an evaluation with a qualified examiner can cost hundreds of dollars. That is appropriate for high-stakes decisions such as disability determinations or special education eligibility, but many adults simply want an accurate, well-normed measure of their own cognitive ability.

For that purpose, the RIOT IQ test (the Reasoning and Intelligence Online Test) offers a research-grade alternative for adults 18 and older. Developed by RIOT IQ with psychometrician Dr. Russell T. Warne, it includes 15 subtests across six cognitive indices: verbal reasoning, fluid reasoning, spatial ability, working memory, processing speed, and reaction time. The full battery takes about 52 minutes and reports scores on the same mean-100, standard-deviation-15 scale the RIAS-2 uses, so results are directly comparable to familiar IQ metrics. It does not replace an individually administered diagnostic evaluation like the RIAS-2, but for self-knowledge it delivers far more than the unnormed quizzes that dominate the internet. You can take it at riotiq.com.

RIAS-2 stands for the Reynolds Intellectual Assessment Scales, Second Edition, named for its lead author, psychologist Cecil R. Reynolds. It is published by PAR.

The RIAS-2 is normed for ages 3 through 94, one of the widest age ranges of any individually administered intelligence test.

The publisher lists 20 to 25 minutes for the core intelligence subtests, with optional memory and speeded processing subtests adding roughly 8 to 10 minutes each. All eight subtests can be completed in under an hour.

The RIST-2 is a screening test built from two RIAS-2 subtests, Guess What and Odd-Item Out. It produces one composite score in 10 to 15 minutes, while the full RIAS-2 yields separate verbal, nonverbal, composite, memory, and speeded processing indexes.

Yes. The RIAS-2 is a professionally developed, individually administered intelligence test with national norms, and its Composite Intelligence Index uses the standard IQ scale with a mean of 100 and a standard deviation of 15.

No. The RIAS-2 requires a qualified professional examiner, and remote administration is limited to modified videoconference procedures conducted by that examiner. Adults who want a normed self-administered measure can consider the RIOT IQ test.

1. PAR, Inc. (2026). Reynolds Intellectual Assessment Scales, Second Edition, Normative Update (RIAS-2 NU). parinc.com

2. PAR, Inc. (2026). RIAS-2 and RIST-2: Reynolds Intellectual Assessment Scales, Second Edition, and Reynolds Intellectual Screening Test, Second Edition (legacy product information). parinc.com

3. PAR, Inc. (2026). Reynolds Intellectual Screening Test, Second Edition, Normative Update (RIST-2 NU). parinc.com

4. PAR, Inc. (2016). Reynolds Intellectual Assessment Scales, Second Edition (RIAS-2) and Reynolds Intellectual Screening Test, Second Edition (RIST-2): Fact sheet. parinc.com

5. Reynolds, C. R., %26 Kamphaus, R. W. (2026). RIAS-2 NU Interpretive Report (sample). PAR, Inc. parinc.com

6. Pearson. (2024). Wechsler Adult Intelligence Scale, Fifth Edition (WAIS-5). pearsonassessments.com

Hero photo: A calm, empty therapy room with armchairs and a side table, the kind of quiet clinical setting where a psychologist administers an assessment like the RIAS-2. Photo by RMtherapies, CC BY-SA 4.0, via Wikimedia Commons; cropped from the original.