What the KBIT-2 test measures and who may give it

0 The short answer

The KBIT-2 is the Kaufman Brief Intelligence Test, Second Edition, a Pearson test that an examiner gives, in person or remotely, in about 20 minutes to people aged 4 to 90, with 3 subtests that yield a Verbal score, a Nonverbal score and an IQ Composite, and Pearson lists it at Qualification Level B, which restricts it to qualified buyers. Pearson now sells the KBIT-2 Revised (August 2022, norms from 2021) and says the original is going out of print, so an adult who wants one of them has to ask a psychologist or clinic that owns the kit, because the Pearson pages we opened list no self administered online edition. A normed online battery is a different test, not a KBIT-2: ACIS Quick costs 15 dollars one time and takes about 45 minutes (prices read October 29, 2026). The decisive limit is that a three subtest estimate is a screening level result by design, so it cannot replace a full battery given by a psychologist, and an unsupervised online battery cannot replace either.

1 What Is the KBIT-2, and What Did the KBIT-2 Revised Change?

The KBIT-2 is a brief individually administered intelligence test by Alan S. Kaufman and Nadeen L. Kaufman, and its 2022 revision keeps the same three subtests, the same age range and the same time while replacing the norms and refreshing the items. Pearson's product page for the KBIT-2, which we opened on October 29, 2026, describes it as a brief measure of verbal and nonverbal intelligence for ages 4 through 90 years, lists an administration time of about 20 minutes, an easel based format and manual scoring, and says the norms come from a national standardization sample matched to U.S. census data. It also states that the KBIT-2 is going out of print and that the KBIT-2 Revised is now available. Pearson's page for the Revised edition, opened the same day, gives a publication date of August 2022 and a norms year of 2021, and it lists the same ages (4:0 to 90:0) and the same time of about 20 minutes.

The two editions share their structure, so most of what follows applies to both. The differences are in what Pearson calls the refresh. Its page for the Revised edition lists modernized item art, new norms based on the most recent U.S. census data available at publication, guidance for remote administration with normative data from remote administered cases, item content updated to better reflect learners' experiences, and updated intercorrelations with other tests. Pearson's 2022 side by side comparison sheet, a PDF we opened on October 29, 2026, adds detail on the items without showing them. It says Matrices lost one item that evaluation showed could be dropped without effect on reliability and gained newly designed difficult items to extend the range for higher ability. It says Riddles lost five items for diversity and bias concerns, gained two difficult items and is shorter overall. It also says the data for the original edition were collected in 2002 to 2003, and the data for the Revised edition in 2021. That works out to about 18 or 19 years between the two norm samples, which is our arithmetic from the two printed dates.

The edition is the first thing to check, because it decides which group your score is compared with. A report that says only "KBIT-2" could rest on either set of norms, and the page on how IQ scores are normed explains why an IQ is always a position within a reference group and never a free standing number. If someone gives you a KBIT-2 result, ask which edition was used and on what date. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) say in the introduction to their chapter on psychological testing and assessment that, for tests that have been revised, the editions currently supported by the publisher usually should be selected, and that professionals are responsible for guarding against reliance on test scores that are outdated. Pearson's page for the Revised edition also states that it was reviewed in the Twenty-Second Mental Measurements Yearbook of the Buros Center for Testing. We did not open that review, so this page does not report what it concluded.

The KBIT-2 is one of several brief instruments, and each has its own page on this site. The RIAS-2 page, the Shipley-2 page and the TONI-4 page cover those tests on their own terms, and this page stays with the KBIT-2.

2 Who May Buy and Give the KBIT-2?

Pearson lists the KBIT-2 and the KBIT-2 Revised at Qualification Level B, which means a buyer must show a relevant degree, certification or professional license, so the test is meant for trained professionals and not for private purchase. Pearson's page on purchasing as a qualified user, which we opened on October 29, 2026, says customers with Level C can purchase any product on the site, customers with Level B only Level B or Level A products, and customers with Level A only Level A products. Its qualifications policy, opened the same day, says there are no special qualifications for Level A products and that tests with a C qualification require a high level of expertise in test interpretation. For Level B, the policy lists several routes. One is a master's degree in psychology, education, speech language pathology, occupational therapy, social work, counseling or a closely related field, together with formal training in the ethical administration, scoring and interpretation of clinical assessments. Another is certification by, or full active membership in, a professional organization that requires relevant assessment training and experience. A third is a degree or license to practice in healthcare or allied healthcare.

Compare that with the other Pearson tests an adult may meet. Pearson's page for the WASI-II, which we opened the same day, lists Qualification Level C, and its page for the WAIS-5 also lists Level C. The KBIT-2 sits one step lower, which fits its purpose as a brief measure, but it is still a restricted test. The table later in this page shows the three side by side.

Price is the second barrier. Pearson's page for the KBIT-2 Revised lists a complete kit in print at 446.00 dollars, with a Q-global scoring subscription bundle at the same price. It lists record forms (25) at 95.70 dollars, a one year Q-global scoring subscription at 60.00 dollars, a single Q-global score report at 1.65 dollars, a print manual at 127.50 dollars and a print stimulus book at 254.90 dollars. These are what a clinician or school pays for materials, they are not what a client pays for an assessment, and Pearson does not publish what an examiner charges. A page that offers "a KBIT-2 test" to a private person for a few dollars is not offering the publisher's kit, whose materials alone cost the amounts above. The pages on what official routes to an IQ score exist and on what a professional IQ test involves cover what a psychologist's session costs and what it returns.

The qualification rule is not red tape for its own sake. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014), which we read in their open access edition, say in Standard 7.7 that test documents should specify the user qualifications required to administer and score a test and those needed to interpret the scores accurately. Standard 9.1 adds that all special qualifications for administration or interpretation specified in the test manual should be met. Standard 10.1 says those who use psychological tests should confine their testing to areas of competence shown through education, training, experience and appropriate credentials. The American Psychological Association's APA Guidelines for Psychological Assessment and Evaluation (2020), which we opened as a PDF on October 29, 2026, make the same point in Guideline 1, which asks psychologists to develop and maintain their own competence in selecting, using and interpreting measures. The practical reading for an adult is simple: the person who gives you a KBIT-2 should be able to tell you their qualification, which edition they used and what the score is for.

3 What Does the KBIT-2 Measure, in CHC Terms?

The KBIT-2 samples two broad abilities that the Cattell-Horn-Carroll model calls crystallized knowledge (Gc) and fluid reasoning (Gf), and it does so with 3 subtests, so it is a narrow window on cognition and not a profile. Pearson's pages label the two scales Crystallized (Verbal) and Fluid (Nonverbal), and the third score is an IQ Composite. The stimulus book of the KBIT-2 Revised, according to Pearson's page for it, holds three subtests: Verbal Knowledge, Matrices and Riddles. Pearson's comparison sheet pairs Verbal Knowledge and Riddles when it describes moving scores into a KABC-II NU battery and speaks of the verbal subtests, and it says gifted and talented centers use Matrices on its own as a measure of nonverbal fluid reasoning. Read together, the two documents point to a verbal score that rests on two subtests and a nonverbal score that rests on one.

The CHC labels are worth defining, because this page and the ACIS pages use them precisely. In a 2020 article in Intelligence, Jacqueline Caemmerer, Timothy Keith and Matthew Reynolds describe Gc as the breadth and depth of acquired cultural knowledge, including language and information learned inside and outside school, and Gf as the ability to solve problems using unfamiliar information or novel procedures that cannot be performed automatically. Their study drew nearly 4,000 youth aged 6 to 18 from the standardization and linking samples of seven tests and supported a CHC model across six batteries. The KBIT-2 was not one of them, so the study does not validate the KBIT-2. It is useful for another reason. In their model, fluid reasoning had a loading of 0.992 on the general factor and no unique variance that differed statistically from zero, which the authors read as Gf and g being statistically indistinguishable in that analysis. That is one reason a single matrix task is attractive as a short route toward a general estimate, although a single study of young people does not settle the question for adults. The page on the CHC model explains the model and its abilities, and the page on what IQ measures covers the general factor and its limits.

What the tasks look like matters less than what they sample, and the formats can be described without showing an item. Pearson's comparison sheet says the original Verbal Knowledge items were presented with hand drawn illustrations and pictures of generic topics and that the Revised edition refreshed some of them. Riddles items have correct and incorrect responses that Pearson updated with modern answers. Matrices belongs to the family in which a person studies a pattern and infers what completes it, the format the ACIS page on matrix reasoning describes in CHC terms as rule discovery in unfamiliar visual patterns. The ACIS page on vocabulary describes a different task, depth and precision of word knowledge, so it should not be read as a description of the KBIT-2 subtest, but it shows how a knowledge based verbal subtest is interpreted. Neither ACIS page reproduces an item, and this page does not either.

Two pages on this site cover the labels people attach to such scores. The page on verbal IQ tests explains what a verbal score measures, and the page on nonverbal IQ tests covers the uses, accuracy and limits of nonverbal measures. The KBIT-2 calls its scales Verbal and Nonverbal, but its own labels in parentheses, Crystallized and Fluid, are the more exact description of what the three subtests sample.

Just as important is what the KBIT-2 leaves out. The three subtests Pearson names include none built for working memory, processing speed or quantitative knowledge, so the scores say nothing specific about those abilities. A full battery separates them. The page on the cognitive domains in IQ testing covers the cognitive domains in CHC terms, and the sibling page on the Verbal Comprehension Index shows what an index built from several verbal subtests returns, which is a wider sample of crystallized knowledge than two subtests can give.

4 How Is the KBIT-2 Scored, and How Do You Read the Result?

A KBIT-2 result is three standard scores on a scale with a mean of 100 and a standard deviation of 15, each with a percentile rank for the person's age, and the sound way to read it is as a position within a reference group with a range around it, not as a fixed fact about a person. Pearson's page for the KBIT-2 says the scores reported are Crystallized (Verbal), Fluid (Nonverbal) and IQ Composite, as standard scores with a mean of 100 and a standard deviation of 15 and as percentile ranks by age. The Revised page lists manual scoring or Q-global scoring. Pearson's comparison sheet adds that the Revised edition reports scaled and standard scores using 90 percent and 95 percent confidence intervals, where the original used a 90 percent interval, and that it offers a scaled score comparison for the verbal subtests.

The scale itself is a convention. A mean of 100 and a standard deviation of 15 means that, within the norm group, about two thirds of people fall between 85 and 115. The table converts a few standard scores into percentile ranks on an ideal normal curve. These percentiles are our arithmetic from the normal curve and are not taken from any Pearson table, which is built from the norm sample and can differ slightly. They show the shape: a score of 130 is not 30 percent higher than 100, it is two standard deviations above the group mean.

The pages on why the standard deviation is 15 and on IQ scores versus percentiles explain the scale and why scores and percentiles cannot be averaged together, and an IQ percentile calculator converts any standard score into a percentile on the same ideal curve. When you receive a report, read in this order: which edition produced the norms, what the three scores are, what interval surrounds each, and which subtests stand behind each score. A report that prints a single IQ Composite and no interval tells you less than one that prints all three scores with their intervals.

The word "composite" deserves a second look. The IQ Composite combines the verbal and nonverbal scores, so it inherits the strengths and weaknesses of all three subtests together. If the verbal and nonverbal scores are far apart, a single composite hides that, and the number to look at is the gap, which a later section of this page treats separately because a gap between two short scores is less reliable than either score alone.

5 Can You Take the KBIT-2 Online, for Free, or Practice With Its Questions?

You cannot take the KBIT-2 yourself online or for free, because Pearson sells an examiner administered, easel based kit to qualified buyers, and the online parts its pages describe are digital stimulus books, online scoring and remote administration by an examiner. On the KBIT-2 Revised page, which we opened on October 29, 2026, Pearson lists complete kits in print and digital, notes that digital stimulus books and manuals are view only, offers Q-global scoring, and gives guidance for telepractice together with normative data from remote administered cases. Its comparison sheet says the Revised edition supports in person and remote administration with one norm for both. In every one of those descriptions an examiner runs the session. None of the Pearson pages we opened lists a self administered edition, a free edition or a trial.

That answers three of the most common searches. In Pearson's terms, "KBIT-2 test online" means an examiner giving the test remotely under its telepractice guidance. "KBIT-2 test free" has no publisher version behind it, and the Pearson prices read on October 29, 2026 are the prices of materials for professionals. "KBIT-2 test questions" is the search to treat most carefully. The items of a test like this are secure, and the Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014), in their discussion of fairness, say that unauthorized distribution of items to some examinees but not others could provide an advantage to some test takers and that in those situations results should be interpreted with caution. A person who has seen the real items before a session would produce a score that no longer means what the norms assume. For that reason this page describes formats only, and it names no item, answer or scoring key.

A reader who wants to know whether a brief test of this kind suits them has better routes than hunting for questions. One is to ask the psychologist or clinic what they will use and why, which the qualification rules above make a reasonable thing to ask. Another is to try a normed online battery whose publisher shows its format without its items. The ACIS subtest pages do that, and the page on a free IQ test online covers the free ACIS route. The page on every way to take an IQ test lays out in person and online routes side by side. A free trial is a taste of a different test, not a KBIT-2, and a result from it should never be reported as one.

6 Which Real Options Give an Adult an IQ Estimate, and How Do They Compare?

The real options differ in whether an examiner is present, in how many subtests stand behind a score and in who the score is compared with, and a short test is cheap in minutes but not automatically cheap in cost or in what it can support. The table compares the KBIT-2 with the other Pearson brief and full Wechsler tests that Pearson's own pages describe and with the three ACIS forms. Every Pearson fact and price comes from a page we opened on October 29, 2026, prices can change, and where a page printed no price the cell says so.

Three readings follow. First, the KBIT-2 is the briefest and the only one in the table that reaches down to age 4, which is why its stated uses include screening children for a fuller evaluation. Second, the WASI-II is the closest Wechsler counterpart in length, and the page on the WASI-II owns that comparison in depth. Third, the ACIS forms are longer than the KBIT-2 at every size, and they sample more domains, but they are not supervised and they are not a replacement for an examiner administered result. The pages on the Stanford-Binet test online and on the Woodcock-Johnson V cover the two other full batteries a psychologist might give, so they are not repeated here.

7 What Can a Brief IQ Estimate Replace, and What Can It Not?

A brief IQ estimate can stand in for a full battery only for the purposes its publisher lists, such as quick screening and re-evaluation, and it cannot replace a full battery when a decision about a person depends on the exact score or on the pattern behind it. Pearson's page for the KBIT-2 Revised lists its intended uses: estimating an individual's relative verbal and nonverbal ability against a representative national sample, identifying learners who may benefit from enrichment or assistance programs, rapidly screening large groups to flag students who may need a comprehensive psychoeducational evaluation, supporting gifted and talented selection, assessing adults quickly in settings such as prisons, group homes, rehabilitation clinics or mental health centers, and reevaluating ability after treatment or a significant life event. The page for the original edition describes the same family of uses, including re-evaluating people who had a thorough cognitive assessment earlier. Most items on that list are a first look or a follow up, and none presents the brief test as a substitute for a comprehensive evaluation.

The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) define a screening test in their glossary as a test used to make broad categorizations of test takers as a first step in selection decisions or diagnostic processes. A first step is the role that the uses Pearson lists give to a brief test. The sound sequence is a brief estimate that raises or lowers a question, followed, where the answer matters, by a fuller evaluation.

Research on brief Wechsler forms shows why the sequence matters. Bradley Axelrod compared the Wechsler Abbreviated Scale of Intelligence (the first WASI, not the KBIT-2) with the WAIS-III in a mixed clinical sample of 72 people, in a 2002 article in Assessment, of which we read the abstract. He reports that the WASI verbal IQ was significantly higher than the WAIS-III verbal IQ, that the performance IQ estimates all differed from the actual WAIS-III performance IQ and Full Scale IQ, and that the WASI did not consistently demonstrate desirable accuracy in predicting WAIS-III scores. He concluded that clinicians should use it cautiously if at all when accurate estimates of an individual's WAIS-III results are needed. That is a finding about a different brief test, an older full battery and a clinical sample, so it cannot be transferred to the KBIT-2. It does show what to ask of any short test: how closely does it track the longer battery for the kind of person in front of you, and for what decision?

The KBIT-2 has also been used in research with adults. A 2009 study in the Journal of Intellectual Disability Research by Vanny, Levy, Greenberg and Hayes (we read the abstract) assessed accused persons aged over 18 at four Magistrates Courts in New South Wales, Australia, with the KBIT-2, the Vineland Adaptive Behavior Scales, Second Edition, and a psychiatric checklist. On the KBIT-2, 10 percent of the participants had a standard score below 70 and a further 20 percent were in the 70 to 79 range. On the Vineland scale, 12 percent were below 70 and a further 9 percent in the 70 to 79 range. Those are findings about a court sample and describe the group, not any person in it. Our reading is that the two measures did not flag the same share of people, which is a reminder that an IQ estimate and adaptive behavior are separate questions. The APA Guidelines for Psychological Assessment and Evaluation (2020) say the same in general terms. Guideline 7 asks psychologists to use multiple sources of relevant and reliable information, and Guideline 6 asks them to select tools with sufficient validity evidence for their uses and sufficient score reliability.

For a concern about attention, memory, an injury or a medical condition, a brief IQ estimate is not the tool at all, and the page on neuropsychological testing for adults explains the scope and cost of the evaluation that is.

8 Is a Three Subtest Score Precise Enough? What the Standards Say About Scores and Gaps

A score built from two or three subtests carries a wider band of error than a score from a full battery, and the gap between a verbal and a nonverbal score carries a wider band still, so the gap is a question for further testing and not an answer. The Standards for Educational and Psychological Testing are direct on this. Standard 2.3 says that for each total score, subscore or combination of scores that is to be interpreted, estimates of relevant indices of reliability and precision should be reported, and its comment adds that reporting them only for total scores is not sufficient when subscores are also interpreted. Standard 2.4 asks for reliability and precision data, including standard errors, for the differences between two observed scores when the interpretation emphasizes such differences. Its comment says that when the interpretation of scores centers on the peaks and valleys of a profile, the reliability of score differences is critical, and it notes that differences between verbal and performance scores on intelligence tests are often used in the diagnosis of cognitive impairment and learning problems.

A worked illustration with invented numbers shows the effect. These are hypothetical inputs for the arithmetic, not statistics of the KBIT-2, which we did not take from its manual. Suppose a score has a reliability of .90. On a scale with a standard deviation of 15, its standard error of measurement is 15 times the square root of .10, about 4.7 points, so a 95 percent band around an obtained score spans roughly 9 points either way. If the reliability is .80, the standard error is about 6.7 and the band about 13 points either way. Now take two such scores and ask how large a gap must be before it exceeds 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. With two scores of reliability .90 it is about 6.7 points and the 95 percent band is about 13 points. With two scores of reliability .80 it is about 9.5 points and the band about 19 points. In other words, under both sets of invented numbers a 10 point gap between a verbal and a nonverbal score could be nothing more than error, and only under the second set does a 20 point gap clearly exceed it. Real tests have their own values, and the manual of the test in use, not this page, holds them.

Two further points keep the reading honest. First, a gap that exceeds error can still be common, and the page on how common index score differences are covers how often large gaps appear in the general population. Second, the nonverbal side of the KBIT-2 rests on a single subtest according to Pearson's pages, so a single task, a lapse of attention or an unlucky item set weighs more than it would in a score built from several. The page on reliability and validity explains why a score can be consistent without measuring what a reader assumes. Any reader of any test, the KBIT-2 included, should ask to see the equivalent evidence in the manual before leaning on a small difference.

9 Which Route Fits an Adult Who Searched for the KBIT-2?

The right route depends on what the score is for: a number that others will rely on needs an examiner administered test chosen by a psychologist, and a private look at where you stand can come from a normed online battery that says plainly what it is. Four cases cover most readers.

If the score is for a school, a workplace, a medical file or a legal matter, the route is a psychologist. The professional chooses the instrument, which may be a brief test, the WASI-II, the WAIS-5 or another battery, and the person who gives it carries responsibility for the qualification, the administration and the interpretation. The pages on the official routes to an IQ score and on the standards behind a professional IQ test describe what to expect, and a reader who wants to understand a result after the fact can use this page to ask the right questions: which edition, which norms, which subtests, which interval.

If you are curious about where you stand and are 16 or older, a normed online battery built for adults is the nearest thing to what you searched for. The page on IQ tests for adults covers what an adult can take online, and the section below compares ACIS Quick with the KBIT-2 directly.

If the question is whether you might be gifted, note that Pearson's own stated use for the KBIT-2 in this area is selecting students. The page on the gifted test for adults explains what an adult can usefully do to confirm where they stand,.

If you landed here while comparing brief tests, the pages on the RIAS-2, the Shipley-2 and the TONI-4 in this series each cover their own test, and none of those tests is interchangeable with the KBIT-2.

10 How Does ACIS Quick Compare With the KBIT-2 on What Each Reports?

ACIS Quick and the KBIT-2 are both short normed tests, but they differ in who gives them, how many subtests stand behind the score and who may take them, so one cannot stand in for the other and neither should be reported as the other. The comparison below uses only what each publisher states. It says nothing about which is more accurate, because accuracy depends on evidence that this page does not report for either test.

The overlap is in two abilities. Both tests sample verbal knowledge and fluid reasoning, and ACIS Quick uses two subtests for each, where the KBIT-2 uses two and one. ACIS Quick adds a third domain, working memory, through two subtests that present their items as audio and therefore need working sound. More subtests behind a score is a design difference that can make a score more stable, but this page does not claim that it does, because that claim needs evidence about the particular tests. For a first look at the ACIS formats, the page on the Quick IQ test describes what a short ACIS battery costs you.

What each reader receives also differs. A KBIT-2 report comes from an examiner who can observe how a person approached the tasks, which is the advantage the Standards describe when they say that test administration can give skilled examiners the opportunity to observe performance under standardized conditions. An ACIS result comes from a session nobody watched, and the limits at the end of this page state that plainly.

11 What Conditions Does Each Kind of Session Need?

A score is only as meaningful as the conditions that produced it, so an examiner session and an unsupervised online session each need different safeguards, and the reader should know which one produced the number. For an examiner session, Standard 6.1 of the Standards for Educational and Psychological Testing says test administrators should follow carefully the standardized procedures for administration and scoring specified by the developer. That includes the instructions, time limits and materials. The introduction to the chapter on psychological testing and assessment adds that the interpreter of results should be informed if the test was unproctored or administered under nonstandardized procedures. For that reason a result from an unsupervised session should be labeled as such wherever it is reported.

For an unsupervised session on a computer, the Standards, in their discussion of fairness, note that examinees must have access to technology so that aspects of the technology itself do not influence scores, and that examinees on older, slower equipment may be disadvantaged. They also say, in Standard 6.5, that test takers should be given instructions, practice and other support to reduce construct irrelevant variance, including instruction in the use of equipment or software that may be unfamiliar. In practice, for an ACIS session this means a working device and browser, a quiet room, no one else helping, and sound that works. Digit Span, Alphanumeric Sequencing and Arithmetic present their items as audio, so a session without working sound cannot complete them. ACIS allows breaks, saves progress between subtests and gives 30 days to complete a form, which suits an online session and has no counterpart in a 20 minute examiner session.

Language is the other condition. Pearson's page for the KBIT-2 says the Verbal scale is administered in English but that correct responses in other languages also receive credit, and its page for the Revised edition says the nonverbal subtest can be administered in any language. ACIS is English only, and its manual says verbal and knowledge tasks are affected by English proficiency and educational exposure, so a reader whose first language is not English should read the verbal results with that in mind. The APA Guidelines for Psychological Assessment and Evaluation (2020) make a parallel point in Guideline 8, which asks psychologists to be aware of the need for test selection, scoring and administration to reflect the appropriate normative comparison, situational influences, effort and standardized administration as indicated.

12 Where ACIS Sits, and What a Buyer Should Do

ACIS is an online, unsupervised, English only battery of cognitive tasks with adult norms, it is not a KBIT-2 and not a clinical screener, and a buyer should treat its result as a normed look at where they stand and not as an official or diagnostic score. The limits come first. ACIS is not a clinical or diagnostic instrument. It is not for hiring, for school accommodations or for admission to high IQ societies. It cannot tell you whether you have a learning disability, an attention condition or an intellectual disability, and a score on any single test, including a KBIT-2, cannot either. The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) ask, in Standard 10.2, that those who select tests and draw inferences from scores be familiar with the relevant evidence of validity and reliability for the intended uses and be prepared to articulate a logical analysis that supports the inferences made. The APA Guidelines for Psychological Assessment and Evaluation (2020) add, in Guideline 6, that tools should show sufficient validity evidence for their uses and sufficient score reliability, and, in Guideline 7, that psychologists use multiple sources of relevant and reliable information.

The strengths are real and bounded. Every ACIS form reports a Full Scale IQ with its 95 percent confidence interval against adult norms that cover ages 16 to 90, and the Full Scale form measures all 20 subtests in six domains. It is a one time payment with no subscription: Quick costs 15 dollars, Optimized 30 dollars and Full Scale 50 dollars, all read on October 29, 2026, and prices can change. A free trial needs no card. The Custom Test lets a buyer pick subtests at 5 dollars each. The refund wording is: "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 refund, not an unconditional money back guarantee. The technical manual documents the instrument, and this page quotes no statistic from it.

The concrete next step depends on the goal. If the result must satisfy a school, an employer or a clinician, ask a psychologist which test they will give and why, using the questions in this page. If you want to see where you stand, open the Quick example report to see what a short form prints, start the free trial with no card, and choose the form that covers the domains you care about. Do not report any online result as a KBIT-2.

13 Sources Behind This Page

Every third party fact and figure on this page comes from the documents below, opened or verified on October 29, 2026, and any figure we calculated ourselves is labeled in the text as our arithmetic. Where we read only an abstract, the entry says so, and the Pearson pages were read as published that day. Prices and policies on commercial pages change, so check the page before you pay.

1. Pearson Assessments (2026). Kaufman Brief Intelligence Test, Second Edition (KBIT-2), product page. Ages, scales, time, qualification level and norms description. Read on October 29, 2026. https://www.pearsonassessments.com/en-us/Store/Professional-Assessments/Cognition-%26-Neuro/Kaufman-Brief-Intelligence-Test-%7C-Second-Edition/p/100000390.html
2. Pearson Assessments (2026). Kaufman Brief Intelligence Test, Second Edition Revised (KBIT-2 Revised), product page. Publication date, norms year, subtests, uses, scoring options, kit and component prices. Read on October 29, 2026. https://www.pearsonassessments.com/store/usassessments/en/Store/Professional-Assessments/Cognition-%26-Neuro/Kaufman-Brief-Intelligence-Test,-Second-Edition-Revised-/p/P100013000.html
3. Pearson Assessments (2022). KBIT-2 Revised comparison sheet (side by side with the KBIT-2), PDF, document code C1025C SR 08/22. Read on October 29, 2026. https://www.pearsonclinical.asia/content/dam/school/global/clinical/us/assets/kbit/kbit2-revised-comparison.pdf
4. Pearson Assessments (2026). Qualifications policy. Level A, B and C definitions and the routes to Level B. Read on October 29, 2026. https://www.pearsonassessments.com/professional-assessments/ordering/how-to-order/qualifications/qualifications-policy.html
5. Pearson Assessments (2026). Purchasing as a qualified user. Which levels may buy which products. Read on October 29, 2026. https://www.pearsonassessments.com/professional-assessments/ordering/how-to-order/qualifications/purchasing-as-a-qualified-user.html
6. Pearson Assessments (2026). Wechsler Abbreviated Scale of Intelligence, Second Edition (WASI-II), product page. Ages, subtests, times, qualification level, standardization sample and kit price. Read on October 29, 2026. https://www.pearsonassessments.com/en-us/Store/Professional-Assessments/Cognition-%26-Neuro/Wechsler-Abbreviated-Scale-of-Intelligence-%7C-Second-Edition/p/100000593.html
7. Pearson Assessments (2026). WAIS-5 (Wechsler Adult Intelligence Scale, Fifth Edition), product page. Ages, publication year, qualification level and completion times. Read on October 29, 2026. https://www.pearsonassessments.com/en-us/Store/Professional-Assessments/Cognition-%26-Neuro/Wechsler-Adult-Intelligence-Scale-%7C-Fifth-Edition/p/P100071002
8. 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 2.3, 2.4, 6.1, 6.5, 7.7, 9.1, 10.1 and 10.2, the glossary entry for screening test, and the introductions to the chapters on fairness and on psychological testing and assessment. Open access edition: https://www.testingstandards.net/open-access-files.html
9. American Psychological Association (2020). APA Guidelines for Psychological Assessment and Evaluation. Approved by the APA Council of Representatives, March 2020. Guidelines 1, 6, 7 and 8. https://www.apa.org/about/policy/guidelines-psychological-assessment-evaluation.pdf
10. Caemmerer, J. M., Keith, T. Z., and Reynolds, M. R. (2020). Beyond individual intelligence tests: Application of Cattell-Horn-Carroll theory. Intelligence, 79, 101433. Full text read as a PDF. https://doi.org/10.1016/j.intell.2020.101433
11. Axelrod, B. N. (2002). Validity of the Wechsler Abbreviated Scale of Intelligence and other very short forms of estimating intellectual functioning. Assessment, 9(1), 17 to 23. Abstract read through PubMed; full text not opened. https://doi.org/10.1177/1073191102009001003
12. Vanny, K. A., Levy, M. H., Greenberg, D. M., and Hayes, S. C. (2009). Mental illness and intellectual disability in Magistrates Courts in New South Wales, Australia. Journal of Intellectual Disability Research, 53(3), 289 to 297. Abstract read through PubMed; full text not opened. https://doi.org/10.1111/j.1365-2788.2008.01148.x

14 Frequently Asked Questions