Which IQ profile test gives you a profile you can trust

0 The short answer

An IQ profile test is a normed battery that reports several index scores, such as verbal comprehension, fluid reasoning, working memory and processing speed, next to a Full Scale IQ, and a profile is only as trustworthy as the number of subtests behind each index, the confidence interval around each index and the base rate of the gaps between them. The real options are a psychologist giving a Wechsler battery, whose sample WAIS-5 report prints five primary indices with a 95 percent confidence interval each, and a normed online battery such as ACIS, which reports a Full Scale IQ and up to six indices for 15, 30 or 50 dollars one time (prices read on October 28, 2026) and takes about 45, 110 or 175 minutes. The decisive limit is that large gaps between indices are common in ordinary people, so a profile shows where to look and never what is wrong or what to become. ACIS is online, unsupervised, not clinical and in English only.

1 What Is an IQ Profile Test, and Is a Personality or Learning Style Quiz One?

An IQ profile test is a cognitive ability battery whose report separates performance into several index scores, and a personality inventory, a learning style quiz or a multiple intelligences quiz is a different kind of instrument that does not give a cognitive ability profile. The phrase "IQ profile" names one thing but is used for three. The first is the real one: a set of norm referenced scores, each describing a broad ability, for example a verbal comprehension index, a fluid reasoning index and a working memory index, reported beside a Full Scale IQ. The second is a personality profile, which describes typical preferences and behavior. The third is a list of "intelligences" or "learning styles" produced by a short quiz. Only the first compares your performance on timed, scored tasks with a defined group of adults.

The reason to keep the three apart is evidence. Beatrice Visser, Michael Ashton and Philip Vernon tested Howard Gardner's multiple intelligences theory in a 2006 study in Intelligence. They gave two measures of each of eight proposed intelligences to 200 participants, along with a general cognitive ability test, a personality inventory and self rating measures. They report that all the purely cognitive tests correlated with general cognitive ability and that factor analysis found a large general factor, which is not what a set of independent intelligences would predict. The musical, bodily kinesthetic and one intrapersonal measure did not correlate with general ability, and self estimates of ability matched performance in some domains but not in all of them. Openness to experience was linked to crystallized intelligence, as the authors had hypothesized. For a reader, the practical point is that a quiz which asks what you prefer is measuring a preference, and a score you give yourself is not a measured ability.

What a cognitive profile reports comes from a hierarchy of abilities. The Cattell-Horn-Carroll model, covered on the page on what cognitive domains are, places a general factor at the top, broad abilities beneath it and narrow abilities under those, and a profile test reports the middle layer. A profile does not replace the Full Scale IQ. It splits the same performance into parts, and the question this page answers is how far those parts can be trusted.

2 Which Tests Give a Real Cognitive Profile, and What Does Each Return?

Only a norm referenced battery with several scored indices gives a cognitive profile, and the options differ less in how many scores they print than in whether each score has a stated reference group, a confidence interval and enough tasks behind it. The table compares the routes an adult can take. The prices and facts are those we read on October 28, 2026.

Read the table by the question you are asking. If a professional must interpret the pattern, for example to document a learning or attention concern, the first row is the route, and the pages on every way to take an IQ test and what an IQ test costs cover the process, the wait and the prices. If you want a normed profile for yourself, the later rows are the candidates, and the page on the best online IQ tests compares them. If you only want to see what an ability test feels like, a free IQ test is a fair first step.

The free row deserves a plain reading. The 123test IQ test page, which we opened on October 28, 2026, lists a free culture fair test of 8 questions and a free classical test of 10 questions. It says the free result is an IQ score estimate or the number of questions answered correctly, it does not mention a breakdown by ability, and it says scores are based on comparisons with other people who took the test, which it calls the norm group. A search for "iq profile test" and "cognitive profile test" on the same day returned several free tests that promise a profile. Check that promise against the standard set out below: how many tasks sit behind each score, and whether each score has an interval. A free quiz that prints six bars from 10 questions would struggle to pass.

The professional route is the benchmark, and its structure is public. Pearson's sample WAIS-5 score report shows five primary composites (verbal comprehension, visual spatial, fluid reasoning, working memory and processing speed) and a Full Scale IQ, each with a composite score, a percentile rank, a 95 percent confidence interval and a qualitative description, followed by 15 ancillary composites. The report says the intervals use the standard error of estimation. Pearson's guide to the WAIS-5 ancillary index scores lists those composites. The page on the 20 WAIS-5 subtests describes which subtests build which index.

3 What Does Each Index in a Profile Measure?

Each index is a broad ability in the Cattell-Horn-Carroll (CHC) model, so a profile is a map of six abilities and not a ranking of how smart you are, and the six that matter are crystallized knowledge, fluid reasoning, quantitative knowledge, visual processing, working memory capacity and processing speed. The table gives the ACIS version, with the subtests that feed each index as the ACIS battery lists them. The CHC names (Gc, Gf, Gq, Gv, Gwm and Gs) are the precise labels, and the page on the CHC model explains where they come from and how the narrow abilities below them are named. The narrow abilities for Gc, Gf, Gv and Gs are the ones the ACIS CHC and subtest pages name.

A few subtests make the abstractions concrete, and each has its own page that a buyer can read before paying. Similarities asks you to explain how two concepts are alike, scored 2, 1 or 0 for a best, partial or incorrect answer, with 1 minute 30 seconds per item, and its page describes it as abstract verbal reasoning. Matrix Reasoning shows 32 visual matrices with a missing piece and asks for the image that completes the pattern, with 30 seconds per item, and its page links strong performance to induction and pattern abstraction. Arithmetic presents problems as audio, needs working sound and feeds the quantitative index. Visual Puzzles asks you to choose exactly three pieces that form a completed shape, with the pieces allowed to be rotated but not flipped, and the page places it in visual processing. Digit Span plays digits at one per second and asks for recall forward, backward and in order, which is a long used way to sample working memory capacity. Symbol Search gives 80 puzzles with a 2 minute limit and a penalty for wrong answers, which is perceptual speed under an accuracy constraint. Each of those pages describes the task format and never the items, and so does this one.

Two contrasts are often misread, and the history explains why. For decades Wechsler batteries reported a verbal IQ and a performance IQ, and the page on why the WAIS-IV dropped both explains how profiles moved to indices defined by ability instead of by response format. Verbal and quantitative are not a single dimension of words versus numbers either: the page on 25 years of verbal versus quantitative tilt data shows how that contrast behaves at the high end. An index name describes what the tasks sample, not a personal trait.

4 Which ACIS Form Returns Which Part of a Profile?

A profile is only as complete as the domains a form samples, so the choice between Quick, Optimized, Full Scale and the Custom Test is a choice about which of the six indices you want to see and how many subtests stand behind each. The counts below come from the subtest lists on the ACIS home page, read on October 28, 2026, and the "of" figures are our arithmetic from those lists. Each form is a one time payment with no subscription, breaks are allowed, progress is saved between subtests and you have 30 days to finish. There is a free trial that needs no card.

Three facts follow from the table. First, every form reports a Full Scale IQ with its 95 percent confidence interval, but only the Full Scale form measures all 20 subtests, and ACIS states that the Full Scale IQ from the Custom Test needs the Full Scale battery. Second, the Custom Test follows a clear rule: any domain you complete returns its full index score, and every subtest returns its scaled score, so a buyer who wants one index, for example processing speed from its two subtests, can buy exactly that and nothing else. At 10 subtests the Custom Test costs 50 dollars, the same as the Full Scale form. Third, what a short form prints for a domain it only partly samples is shown by its example report, so open the Quick or Optimized example report before buying and see which indices appear. The page on what a detailed IQ report contains lists what to look for in any report, and the example reports are linked in the boxes on this page.

Besides the six indices, the ACIS technical manual lists 14 composites built from predefined sets of subtests, available when their subtests are available. The manual describes the Cognitive Proficiency composite as one that "combines working memory and processing speed as cognitive proficiency," and the Verbal Knowledge composite as combining Antonyms, Synonyms, Vocabulary and Information. A composite is a different cut of the same subtests, not a new measurement, so the questions below about precision and gaps apply to composites as well. The technical manual documents how each is defined, and this page quotes no statistic from it.

Price is the other axis. The page on the cheapest IQ test compares low cost options on that single axis, and the Full Scale form costs 50 dollars one time on the date we read it, which is 2.50 dollars per subtest in our arithmetic. Prices can change, so read them on the ACIS home page before paying.

5 What Makes a Cognitive Profile Trustworthy? Five Checks

A profile deserves trust when each of five questions has an answer you can read in the report or the manual: how many tasks sit behind each index, whether each index has its own interval, whether the gap between two indices is larger than error, whether that gap is rare, and whether the pattern is shown to predict anything. These are not our invention. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014), which we opened in their open access edition, say in Standard 1.14 that when the interpretation of subscores, score differences or profiles is suggested, the rationale and relevant evidence should be provided. Standard 2.3 asks for reliability and precision estimates for each score or combination that is to be interpreted, and its comment adds that reporting them only for total scores is not sufficient when subscores are also interpreted. Standard 2.4 asks for the same for differences between two scores.

The interval check. A confidence interval says how far an obtained score could sit from the underlying value, and an index built from two subtests has a wider interval than a Full Scale IQ built from many. Pearson's sample WAIS-5 report shows it. For its invented examinee, the Full Scale IQ is 111 with a 95 percent confidence interval of 106 to 116, and the five primary indices are verbal comprehension 124 (115 to 130), visual spatial 103 (96 to 110), fluid reasoning 105 (98 to 111), working memory 97 (90 to 104) and processing speed 108 (99 to 116). Our arithmetic is that the Full Scale interval spans 10 points and the index intervals span 13 to 17. The same report prints a standard error of measurement for each composite, from 3.00 to 5.61, and for each subtest scaled score, from 0.67 to 1.47 on the scale that runs from 1 to 19. The sample report illustrates how a professional report is built, and the shape is the point: the more specific the score, the wider the band. The page on how IQ scores are normed explains the scale those bands sit on, and the page on why the standard deviation is 15 explains how to read a point on it.

The gap check. Two scores that are each uncertain give a difference that is more uncertain than either, and the Standards comment on Standard 2.4 states the stake directly: when the interpretation of scores centers on the peaks and valleys of a profile, the reliability of score differences is critical. It also notes that the reliability of change scores can be much lower than the reliability of the separate scores involved, and the same arithmetic applies to the difference between two indices. A worked illustration with invented numbers shows why. Suppose two indices each have a reliability of .90 and correlate .60 with each other. The classical formula for the reliability of a difference, the average reliability minus the correlation, divided by one minus the correlation, gives (.90 minus .60) divided by (1 minus .60), which is .75. If the two indices correlate .75, the same formula gives .60. The more two indices share, the less reliable their difference is, and indices drawn from one battery share a lot because they all reflect a general factor. These are hypothetical inputs, not ACIS or Pearson statistics.

We can also use the printed standard errors to see how big a gap must be to clear measurement error alone. The standard error of a difference between two scores with independent errors is the square root of the sum of their squared standard errors. For verbal comprehension (4.50) and processing speed (5.61) in the sample report that is about 7.2 points, and 1.96 times that is about 14 points. For verbal comprehension and fluid reasoning (3.00) it is about 5.4 points, or about 11 at the same confidence. This is our arithmetic, it ignores any correction a publisher applies, and a critical value from the test's own manual should replace it whenever one exists. The page on reliability and validity explains why a score can be consistent without being meaningful.

6 How Common Are Large Gaps Between Index Scores in Ordinary People?

Large gaps between index scores are common in people with no condition at all, so a gap of 15 points between two indices is a feature of many normal profiles and not evidence of a strength, a weakness or a disorder. The best known adult figure comes from a conference abstract. In the abstract of a 2011 presentation to the National Academy of Neuropsychology, titled Rates of Apparently Abnormal WAIS-4 Patterns in the Normal Population (read on October 28, 2026), C. Carroll reports that one or more 15 point index score differences occurred in 49 percent of normal individuals, a 20 point difference in 35 percent and a 25 point difference in about 16 percent, among the four indices of the WAIS-IV. The abstract adds that many normal individuals show subtest scores three or more points below their own subtest mean, and it concludes that index and subtest discrepancies are common when all possible comparisons are made, so specific prior hypotheses are needed to limit false positive interpretations.

That is a conference abstract, not a journal article, and it concerns the WAIS-IV, so we cite only the figures it prints and do not extend them to other batteries. The logic generalizes, and it is simple counting. Four indices make 6 pairs, five make 10, and six make 15. Twenty subtests make 190 pairs. These counts are our arithmetic, and they show why a six index profile has more chances to display a large gap than a four index one. Every pair is another opportunity for ordinary measurement error and ordinary variation to produce a difference that looks like something.

The same pattern appears outside intelligence testing. Laurence Binder, Grant Iverson and Brian Brooks reviewed normative studies of how much healthy adults vary across neuropsychological test batteries in a 2009 article in Archives of Clinical Neuropsychology. We read its abstract, which reports that in batteries with at least 20 measures the great majority of normative participants had one or more scores in the abnormal range, using a cutoff of one standard deviation below the mean, and that restricting the samples to people with above average IQ or education, or using a stricter two standard deviation cutoff, did not eliminate those scores. The authors conclude that abnormal performance on some proportion of tests in a battery is psychometrically normal and that low scores do not by themselves signify acquired brain dysfunction. Their subject is neuropsychological batteries, not IQ profiles, and we cite them for the principle: the more scores you compare, the more unusual looking results a healthy person will show.

Two further questions belong to neighboring pages. How large a gap must be before it deserves attention, and how a base rate is applied to an individual profile, are worked out on the page about index score differences. Why people with high overall scores sometimes show wider scatter between indices, a pattern named after Spearman, is reviewed on the page about Spearman's law of diminishing returns, which also covers the dispute over its cause. For a reader of a profile, the working rule is that a gap should be hypothesized before the report is opened and not discovered after, because a discovered gap among 15 pairs has a high chance of being noise.

7 What Does the Research Say About Reading Strengths and Weaknesses From a Profile?

The research is divided but not evenly: the use of an index profile to describe where a person stands against adult norms is well supported, while the use of a personal pattern of peaks and valleys to diagnose, to explain or to prescribe has a long record of weak reliability and weak evidence of use. The fullest recent statement is a review by Ryan McGill, Stefan Dombrowski and Gary Canivez, published in the Journal of School Psychology in 2018 and opened by us on October 28, 2026. It defines cognitive profile analysis as a class of interpretive methods that encourage diagnostic decisions or treatment recommendations from the strengths and weaknesses seen in ability score profiles, and it concludes that replicated evidence for their reliability, validity, diagnostic utility and treatment utility "remains less than compelling." Two limits apply: the review is about school psychology, so most of its studies concern children and adolescents on Wechsler child scales, and the position has defenders, described below.

The review separates two ways of reading a profile, and the difference is the most useful thing a profile reader can learn. A normative reading compares each index with the reference group: an index of 120 is above most adults. An ipsative reading compares each index with the person's own average, or with the Full Scale IQ, and calls the difference a personal strength or weakness. The review summarizes the evidence against the second. McDermott and colleagues in 1992 found, in the WISC-R normative sample, that ipsative scores were significantly less reliable than normative scores, with lower internal consistency and lower stability over time. Watkins and Canivez in 2004 found that WISC-III ipsative strengths and weaknesses were replicated across test and retest at chance levels. Macmann and Barnett in 1997, in a computer simulation on the WISC-III, found that 62.4 percent of the sample showed at least one significant strength or weakness in a breakout composite score, and a still higher rate at the subtest level. These numbers are the review's account of those studies, and we did not read the original papers.

The stability evidence bears on retesting. The review reports that Watkins and Smith in 2013 followed 344 students evaluated twice for special education eligibility across a mean interval of 2.84 years on the WISC-IV. Stability coefficients for the index scores ranged from 0.65 to 0.76, and 29 to 44 percent of the composite scores differed by 10 standard score points or more across the interval. The review does not overstate this: it says there is no established threshold at which a profile is stable enough, and it gives an example in which a child whose highest index exceeded the others by 28 points had a 98 percent probability of still having the highest index at retest but only a 6 percent probability of the same margin, because of regression to the mean. The probability of keeping the top position by 20 points was 32 percent and by 10 points was 77 percent. The authors conclude that most profiles will resemble each other to a reasonable degree over time, but that most identified strengths and weaknesses will not be as extreme on reevaluation. For an adult the direction of that logic applies and the numbers do not transfer: we found no equivalent stability study for adults on the current Wechsler or on ACIS in the sources we opened, so treat 29 to 44 percent as a child sample that illustrates the problem, not a rate that applies to you.

Defenders make a fair point, and the review reports it. Kaufman, Raiford and Coalson, in a 2016 text the review cites, argue that these critiques were unduly harsh and that clinicians do not interpret abnormal findings blindly, absent base rate data and other information about their significance. The disagreement, as the review frames it, is over whether a pattern found by comparing many scores supports a conclusion about a particular person. The Standards put the burden of proof where this page puts it. The comment on Standard 1.14 says that evidence for the validity of interpretations of two or more separate scores would not necessarily justify a statistical or substantive interpretation of the difference between them, and that the rationale and evidence must pertain directly to the specific score, score combination or score pattern to be interpreted for a given use.

8 What Does a Profile Add Beyond the Full Scale IQ?

A profile adds description and a map of where to look, but in the studies that test it against outcomes, index scores add little unique prediction beyond the Full Scale IQ, so a profile is better used to describe than to forecast. The best known adult test of the question is Gary Canivez's 2013 study of WAIS-IV index scores, published in Psychological Assessment. We read its abstract, which reports that the Full Scale IQ accounted for statistically significant and generally large shares of the variance in scores on two editions of a standard achievement test. It reports that, taken together, the index scores added statistically significant explained variance for most of the achievement scores, and that considered one at a time they made only trivial to small unique contributions. The author concludes that the Full Scale IQ should keep primary interpretive weight. We have not read the full text, so we state only what the abstract states.

The 2018 review reports a similar result for another battery: a general ability score accounted for 55 percent of the variance in a reading achievement score, and the broad CHC ability scores combined added 6 percent beyond it. The review adds that there is no established point at which a small increase in explained variance becomes meaningful, so some practitioners will find the added portion compelling and others will question the extra time and cost. That is an honest summary. The data do not say indices are worthless. They say the increments are small, and a small increment is a reason to avoid large claims, not to discard the scores.

Two practical consequences follow. First, the Full Scale IQ is the more precise and the more predictive single number, and the indices explain what it is made of. Second, when the indices differ a lot, a composite that leaves some of them out can answer a different question. The page on the General Ability Index explains the composite that excludes working memory and processing speed, why it exists, and why it is reported beside the Full Scale IQ and not instead of it. Pearson's own flyer on the WAIS-5 ancillary indices lists a general ability composite and a cognitive proficiency composite among its 15 ancillary indices, and the ACIS technical manual lists GAI and CPI among its composites. Those choices are the clinician's and the reader's to make with the interval and the base rate in hand, never a reason to pick the composite that looks best.

What a profile is good for, then, is a bounded list. It tells you which abilities were sampled and how you compared with adults on each, which subtests moved an index, and which one or two comparisons deserve a second look, such as a verbal index far from a fluid reasoning index. It gives you a basis for a conversation with a professional if you have a concern. It does not tell you what you will earn, what you will study or whether you have a condition.

9 How Should an Adult Read a Profile Report, Step by Step?

Read a profile from the most precise score to the least precise, decide your comparison before you look, and treat every pattern as a hypothesis to be checked against other information, not as a finding. The steps below are ours, built from the Standards and the research above, and they are not a protocol from any test manual.

Steps 1 and 2 use the scales the report prints. A Full Scale IQ is a standard score with a mean of 100 and a standard deviation of 15, and the page on the difference between an IQ score and a percentile explains why the two scales should be kept apart. Steps 3 and 4 use the base rates from the earlier section and the critical value, and the page on index score differences works the second through with examples. Step 5 is why the form table matters: an index that rests on two subtests is more exposed to a single unusual result than one that rests on five.

Step 6 is where an unsupervised session differs from a supervised one, and it has a separate section below. Step 7 is the one most readers skip. The Standards comment on Standard 3.4 says that unproctored administrations, where standardization cannot be ensured, should lead to results being interpreted with caution, and the APA guidance cited in the closing section says that test performance is one piece of an assessment. A reader who finds a gap should ask what else would show the same thing: a work sample, a school record, an earlier test, or a clinician's observation. If nothing else agrees, the gap has not earned a place in the story you tell about yourself.

10 What Conditions Does an Unsupervised Profile Test Need?

An unsupervised profile is only as clean as the room it was taken in, and because each index rests on different tasks, one bad subtest can look like a personal weakness when it is a condition of the session. Three of the ACIS subtests present their items as audio and need working sound: Digit Span, Alphanumeric Sequencing and Arithmetic. The Digit Span page says numbers play at one per second and recommends headphones or a quiet space, and the Arithmetic page tells you to wait until the audio finishes before you respond. Several others are timed, and their pages state the limits: Matrix Reasoning gives 30 seconds per item, Visual Puzzles gives 20 or 45 seconds depending on the item, Similarities gives 1 minute 30 seconds per item, and Symbol Search gives 80 puzzles with a 2 minute limit. The pages also say no external aids, such as calculators, notes or scratch paper, are allowed.

The Standards comment on Standard 3.4 explains why this matters beyond etiquette. It says that technology based testing adds concerns for standardization, that examinees working on older or slower equipment may be disadvantaged, and that differences in the speed of devices or the fidelity of visuals may let construct irrelevant factors influence performance. A speed index is the one most exposed, so our practical advice is to sit the speed subtests on a device that responds without lag. Breaks are allowed, progress is saved between subtests and you have 30 days, and that flexibility has a cost for a profile: if you spread the subtests across several days, each index may reflect a different level of fatigue or noise, and a gap between two indices can then be about the day and not about the ability. Where you can, take the subtests of one index in one sitting.

11 What Can a Profile Not Tell You About Careers, School or a Diagnosis?

A profile describes how you performed on sampled tasks against adult norms on one occasion, and it cannot select a career, predict a grade, document a condition or decide any outcome that matters to you. On careers, the sensible statement is narrow: one adult's pattern of indices is not a prescription for an occupation. The page on IQ tests for career guidance covers that decision directly. On school and work decisions generally, the Standards say in Standard 12.10 that in educational settings a decision or characterization that will have major impact on a student should take into consideration not just scores from a single test but other relevant information. The same principle is sensible for any consequential adult decision.

On diagnosis, the line is firm. ACIS is not a clinical or diagnostic instrument. A low working memory index, a high verbal index or a wide gap does not identify any condition, and group statistics about conditions are never a diagnosis of an individual. The McGill review above reports that replicated evidence for the diagnostic utility of profile methods remains less than compelling, which is an additional reason to avoid reading a condition into a pattern. The pages on IQ tests for adults with ADHD and IQ tests for autistic adults cover those readers directly. The rule that applies to every reader is the same: a profile can inform a conversation with a qualified professional, and it cannot replace one.

Nor does a profile support a claim about rare ability. A high index from a short subtest set describes performance on those tasks only. Respect for the reader also means saying what a low score is: a result on a sample of tasks, in one session, with a band around it, and a person is more than the lowest bar on a chart.

12 Where ACIS Sits, and What a Buyer Should Do

ACIS is a normed online battery that returns a Full Scale IQ and up to six indices for adult personal use, and its strengths and its limits are the same fact: it is online, unsupervised, not clinical and in English only, so it is a fair way to see a profile for yourself and the wrong tool for documentation, hiring, school accommodations or a high IQ society. The facts below were read on the ACIS home page on October 28, 2026, and prices can change. ACIS has 20 subtests in six domains, forms at 15, 30 and 50 dollars one time with no subscription, a free trial that needs no card, scores on the standard scale with a mean of 100 and a standard deviation of 15 and scaled subtest scores from 1 to 19, percentiles, a 95 percent confidence interval and adult norms covering ages 16 to 90. The guarantee reads: "Full refund within 5 days if the report does not deliver the features described at checkout or a technical issue prevents you from accessing your results." That is a conditional guarantee, and this page does not describe it as anything broader. The technical manual documents the instrument for a reader who wants method, and the manual itself says that verbal and knowledge tasks are affected by English proficiency and educational exposure.

The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) give the reading rules this page has used. Standard 1.14 asks for evidence for the interpretation of subscores, differences and profiles, Standards 2.3 and 2.4 ask for reliability and precision for each score and each difference that is interpreted, and the comment on Standard 3.4 says unproctored administrations, where standardization cannot be ensured, call for caution. The American Psychological Association's Guidelines for Psychological Assessment and Evaluation (2020) say that accurate interpretation depends on understanding the conceptual meaning of scores and the technical range of interpretation of any set of individual scores, and that performance on a test is only one piece of an assessment, set in a context of referral reasons, background and other sources. Apply both to any profile test, ours included: ask what is behind each index, whether it has an interval, whether the gap between two indices is rare, and whether anything else agrees.

A buyer should do four concrete things. Decide which indices you actually want and pick the form that samples them, using the form table above. Open the example report for that form and check that each index prints its own interval. Write down the single comparison you care about before you look at your gaps. Then start the free trial, which needs no card, and read the report as a description of one session, not a verdict. Every form is a one time payment, and the Full Scale form is the only one that samples every domain.

13 Sources Behind This Page

Every third party fact and figure on this page comes from the documents below, opened or verified on October 28, 2026, and any figure we calculated ourselves is labeled in the text as our arithmetic. Where we read only an abstract, the text says so. Prices and policies on commercial pages change, so check the page before you pay.

1. American Educational Research Association, American Psychological Association, and National Council on Measurement in Education (2014). Standards for Educational and Psychological Testing. Washington, DC: AERA. Standards 1.14, 2.3, 2.4, 3.4 and 12.10 and their comments. Open access edition: https://www.testingstandards.net/open-access-files.html
2. American Psychological Association (2020). APA Guidelines for Psychological Assessment and Evaluation. Approved by the APA Council of Representatives, March 2020. https://www.apa.org/about/policy/guidelines-psychological-assessment-evaluation.pdf
3. McGill, R. J., Dombrowski, S. C., and Canivez, G. L. (2018). Cognitive profile analysis in school psychology: History, issues, and continued concerns. Journal of School Psychology, 71, 108 to 121. https://doi.org/10.1016/j.jsp.2018.10.007
4. Canivez, G. L. (2013). Incremental criterion validity of WAIS-IV factor index scores: Relationships with WIAT-II and WIAT-III subtest and composite scores. Psychological Assessment, 25(2), 484 to 495. Abstract read through search results; full text not opened. https://doi.org/10.1037/a0032092
5. Carroll, C. (2011). Rates of apparently abnormal WAIS-4 patterns in the normal population. Conference abstract, 31st Annual Meeting of the National Academy of Neuropsychology, Marco Island, FL, November 16 to 19, 2011. Read on the NSU Works page on October 28, 2026. https://nsuworks.nova.edu/cps_facpresentations/1607
6. Binder, L. M., Iverson, G. L., and Brooks, B. L. (2009). To err is human: "Abnormal" neuropsychological scores and variability are common in healthy adults. Archives of Clinical Neuropsychology, 24(1), 31 to 46. Abstract read through the publisher record. https://doi.org/10.1093/arclin/acn001
7. Visser, B. A., Ashton, M. C., and Vernon, P. A. (2006). Beyond g: Putting multiple intelligences theory to the test. Intelligence, 34(5), 487 to 502. Abstract read through the Brock University repository record. https://doi.org/10.1016/j.intell.2006.02.004
8. Pearson (2024). WAIS-5 Sample Score Report. A sample report for an invented examinee, read on October 28, 2026. https://www.pearsonassessments.com/content/dam/school/global/clinical/us/assets/wais-5/wais-5-sample-score-report.pdf
9. Pearson (2024). A guide to WAIS-5 ancillary index scores. Read on October 28, 2026. https://www.pearsonassessments.com/content/dam/school/global/clinical/us/assets/wais-5/wais-5-ancillary-index-scores-flyer.pdf

14 Frequently Asked Questions