The error checking test: speed, accuracy, who sets it

0 The short answer

An error checking test asks you to compare strings of numbers, letters or codes with an original under a clock, and it samples perceptual speed with accuracy, a narrow ability inside processing speed (Gs), not general reasoning. SHL, one publisher, describes its version as a multiple choice test of up to 50 questions in 5 minutes for administrative, data entry and sales support jobs, and one UK train operator names an online error checking test in its trainee driver process, while another describes a detail checking test and a third lists different tests altogether. ACIS has no string comparison task; its Symbol Search and Coding subtests sample the same ability family, and they are open in the free trial or in the Full Scale form at 50 dollars for about 175 minutes (prices read October 29, 2026), as a way to see your own processing speed and never as preparation for an employer test. The decisive limit is that nobody can promise what your employer's version contains, so the invitation and the employer's own instructions are the authority.

1 What Is an Error Checking Test?

An error checking test is a short, timed, clerical style test in which you compare information with a reference and decide where it differs, and what it rewards is catching differences quickly without missing real ones or inventing false ones. There is no single official definition, and the names vary. The pages we read on October 29, 2026 use "Checking" (SHL), "error checking test" (Transport for Wales) and "Detail Checking Test" (London North Eastern Railway). This page uses "error checking test" for the whole family, and it does not cover proofreading tests that look for spelling or grammar mistakes in prose.

The most detailed publisher description we could open is SHL's fact sheet for its Verify Checking Test (Next Generation), a one page document with a 2018 copyright line. It says the test is part of the Verify suite of cognitive ability tests and is used "for job candidates applying to jobs at lower levels that require checking ability." Candidates "work with sequences of numbers, letters and combinations of numbers and letters." The fact sheet gives the average testing time and the allowed time as 5 minutes, a maximum of 50 questions, a multiple choice format, and a design for an unproctored environment. It states that the test "measures a candidate's ability to compare information quickly and accurately." The same publisher's fact sheet for the Current Generation version gives 4 to 5 minutes and a maximum of 25 questions, says it uses item response theory, and lists the number of sittings as one plus a verification test. Two versions of one publisher's test therefore differ in length, which is a first reason to distrust any single number you read about "the" error checking test.

The fact sheet for the newer version includes one worked example, and it shows the layout without needing its content: a target sequence is shown, five options follow, the correct answer is the option identical to the target, and every other option differs from it in some way. We do not reproduce that example or any other item from a published test. To make the idea concrete, here is one short example of our own, written for this page and not taken from any test. Original: T58-ARQ. Copy: T85-ARQ. The two middle digits have swapped places, so the copy does not match. The skill is noticing that kind of difference, such as a swapped pair, a missing character or a changed letter, again and again against a clock.

SHL's layout is a choice among options. We found no publisher or employer page that describes a layout in which you mark each mismatch on a code chart. Pages that sell practice material describe such layouts, but a seller's description is not evidence of what an employer sets. As a market fact, a practice suite on one seller's site, priced at 9.99 pounds plus VAT per month on the page we read on October 29, 2026, lists two error checking categories, one for lever tests and one for code tests, and gives no further detail about them. We do not link it and we draw nothing from it about the real test.

The genre is old. The Buros Center for Testing lists the Minnesota Clerical Test, published by Pearson with publication years of 1933 to 1979, as "designed to measure speed and accuracy in clerical work," and records that the publisher told the Center in June 2025 that the test is out of print. The idea of timing how well people compare names or numbers for office work has outlived the product that first packaged it.

2 Which Jobs Use an Error Checking Test?

Employers use an error checking test where the job involves verifying records, data or displays, and the sources we read name administrative, data entry, sales support, purchasing and train driver roles, with the rail pages presenting it as one stage among several. SHL's fact sheet lists the potential job titles as Administrative Support, Data Entry, and Sales Support and Purchasing, and names the tasks: verifying data accuracy and locating data entry errors. It says the test is relevant where critical tasks include "monitoring visual displays, verifying data accuracy and locating data entry errors or reviewing files, records and other information." The phrase "lower levels" matters for a reader who meets the test: the publisher positions it for entry level and clerical work, not for professional or managerial selection.

Checking is only one kind of test an employer can use, and SHL itself calls its checking test part of a suite of cognitive ability tests. A numerical reasoning test is a different format, which the page on the numerical reasoning test covers, and a test of mechanical principles is another, which the page on the mechanical reasoning test describes. The broader category of employer cognitive tests, and what they are for, is the subject of the page on the pre-employment cognitive test.

Government job data point the same way, with one caution. The Occupational Information Network (O*NET), the United States Department of Labor database, defines the ability called Perceptual Speed as "the ability to quickly and accurately compare similarities and differences among sets of letters, numbers, objects, pictures, or patterns," and it includes comparing a presented object with a remembered one. On the database page for Data Entry Keyers (updated 2026, read October 29, 2026), Perceptual Speed has an importance score of 63 out of 100, below Near Vision and Written Comprehension, which score 72, and level with Information Ordering and Oral Comprehension. On the page for Locomotive Engineers, it scores 72, and the database's own ranking for the ability lists Locomotive Engineers fourth, behind air traffic controllers, airline pilots and commercial pilots. The caution is that the database describes United States occupations from its own surveys, and an importance score says how central the ability is to a job, not that a particular company uses an error checking test for it.

Clerical perception has a long history in aptitude batteries too. The page on the General Aptitude Test Battery covers how that battery treats it. A candidate who is asked about reasoning ability in a conversation, and not about checking speed, will find a different subject on the page about the IQ test for a job interview.

3 Is the Error Checking Test Part of UK Train Driver Selection?

It is part of some operators' processes and absent from the lists others publish, so the honest answer for a trainee driver applicant is that it depends on the operator, and the invitation is the only reliable guide. The sources below were opened on October 29, 2026. None is a practice seller.

Transport for Wales states on its drivers page (undated) that a trainee train driver applicant "will be required to complete an online error checking test and a Train Driver Situational Judgement test," that passing leads to a video interview, and that the assessment centre then runs over 2 days: four paper based tests of about 3 hours, then a situational judgement test and 3 computer tests of about 2.5 hours, followed by an interview. The page does not describe the format of the error checking test, its length or its scoring.

London North Eastern Railway describes its apprentice driver process (page copyright 2026) with a timed test it calls the "Detail Checking Test" that assesses attention to detail and accuracy, with the example question "Can you spot the error in a sea of information?" It also lists a situational judgement test and a full day of timed psychometric testing for shortlisted candidates. The page gives no time limit and does not say that this test is an error checking test under another name, so we describe it as a close relative and not as the same test.

Avanti West Coast's train driver recruitment page, which states it was last updated on January 23, 2025, lists a different set. Its online stage includes a Visual Search Exercise and a situational judgement test, its paper assessment centre includes Group Bourdon, the Test of Everyday Attention for Occupational Assessment and the Trainability for Rules and Procedures tests, and its computer stage includes the Vienna tests of vigilance and reaction. The page does not mention error checking.

The assessment provider's own candidate guide agrees that the list changes by operator. The Occupational Psychology Centre (OPC), one of 11 registered assessment centres in the United Kingdom according to the guide, which is dated December 4, 2024, lists the exercises a candidate "will probably sit some or all of": Group Bourdon, Tea-Occ, TRP1B, TRP2, WAFV, ATAVT, 2-Hand, SJE and a structured interview. Error checking is not on that list, and the guide adds that "some train operating companies may also ask you to sit some additional assessment exercises." The guide also says the OPC does not own the process. The number of attempts, the retest policy and the tests to use are issued by the Rail Safety and Standards Board (RSSB) as RIS-3751-TOM, and queries go to the board or the train company.

RSSB's own news page of January 13, 2025 describes that standard as the Rail Industry Standard for psychometric assessment selection of train drivers, now at Issue 4, and says the revision clarifies how long test results remain valid and increases the number of attempts. It names no test. The rules on attempts differ by operator as published: Transport for Wales states three attempts for tests taken on or after December 7, 2024 with a one year wait after a failure, while Avanti's page states two lifetime attempts for its trainee driver process. We cannot reconcile the two from the pages, which is exactly why a reader should take the number from their own operator before they plan anything.

A reader who searches "error checking test train driver" will meet many pages that treat the test as universal. What the opened sources support is narrower: one operator names it, one names a close relative, and two lists of train driver tests do not include it.

4 How Does an Adult Compare the Real Ways to Check Their Own Speed?

There are five real routes: the employer's own test, a practice suite, a free speed game, a psychologist's battery and a normed online battery, and they differ most in what the number is compared with. The table uses only what we could read on October 29, 2026, and where a source is silent the cell says so. A route that answers "how will I do on my employer's test" does not exist outside that employer's process, so the table asks the question that can be answered: where does my own speed stand, and compared with whom?

Pearson's WAIS-5 product page, published for 2024 and read on October 29, 2026, gives the age range, the administration times and the qualification level in the row above, and its administration times cover testing only, not any intake or feedback a clinic adds. A psychologist is the route when a clinic or a school needs documentation. It is not a route to your employer's test.

A free speed game suits curiosity if you remember what it measures. The page on the Human Benchmark IQ test goes through each game and the ability it comes closest to, and the short version is that a reaction time page measures reaction, device and hand together, which is a different thing from comparing strings. The page on free IQ tests says what a free route includes and leaves out, and the page on where to take an IQ test lays out every setting, in person and online, with the evidence behind each.

A normed online battery gives the one thing the other routes do not: your processing speed, set against adult norms, in a session you control. ACIS sells it as a one time payment with no subscription (Quick 15 dollars, Optimized 30 dollars, Full Scale 50 dollars, prices read October 29, 2026 and subject to change). Symbol Search and Coding are both in the Optimized form, and Custom Test lets a buyer choose them at 5 dollars each, which is 10 dollars for the pair by our arithmetic. Readers weighing several online options can read the comparison in the best online IQ tests, and the wider category is described on the page about IQ tests for adults.

5 Which Ability Does an Error Checking Test Measure?

An error checking test samples perceptual speed, the rate at which a person compares similarities and differences among letters, numbers or patterns, together with the accuracy and attention it takes to avoid errors, and it does not sample reasoning. The definition of the ability that fits best is the one the Occupational Information Network publishes: "the ability to quickly and accurately compare similarities and differences among sets of letters, numbers, objects, pictures, or patterns." The phrase "quickly and accurately" carries both halves of the construct, and SHL's fact sheet uses nearly the same words for its test.

In the Cattell-Horn-Carroll (CHC) model, which the page on the CHC model explains, perceptual speed sits among the narrow abilities inside broad processing speed (Gs). The page on processing speed explained describes Gs as the efficiency of simple, overlearned operations under time pressure, and the page on the cognitive domains places it among the six domains of a broad battery. The ACIS technical manual, which the reader can open at the technical manual, says the Processing Speed Index (PSI) captures perceptual speed search, perceptual speed compare and speeded response execution, that Symbol Search reflects perceptual speed search, and that Coding reflects perceptual speed compare with a speeded output component. Matching a copy against an original is, in our reading, closest to the "compare" kind, with some "search" in locating the character that differs. That placement is ours, not a classification published for any particular employer test.

The research literature treats perceptual speed as a measurable ability with practical consequences. Ackerman and Beier (2007) state in their abstract that measures of perceptual speed ability "have been shown to be an important part of assessment batteries for predicting performance on tasks and jobs that require a high level of speed and accuracy." They developed computerized perceptual speed tests to parallel paper and pencil ones, and across three studies (N = 167, 160 and 117) report high reliability and substantial validity for performance on two skill learning tasks. That is a finding about those tasks and samples, not about any employer's checking test.

Two other ingredients matter for the score. The first is attention: the database lists Selective Attention at 60 for data entry keyers and 78 for locomotive engineers, the highest ability in the second occupation. Missing a mismatch is as much a lapse of attention as a lapse of speed. The second is the response itself. Ebaid and colleagues (2017) tested 67 younger adults (aged 18 to 29) and 40 older adults (aged 40 to 81) on Symbol Search, Coding and a pegboard test of hand dexterity. Better dexterity went with faster scores, and age differences on the two paper and pencil tasks remained large after controlling for dexterity. A checking test on a screen adds a mouse or a touch screen, and on paper it adds a pen, so a slow score can reflect the hand, the device or the room and not only the comparison.

What an error checking test does not sample is just as useful to know. It does not ask you to find a rule, solve a problem or hold a long sequence in mind, which is why a high score on it is not evidence of high reasoning and a low one is not evidence of low reasoning. The page on what IQ measures explains why a battery samples several abilities, and speed is one of them.

6 Why Do Speed and Accuracy Trade Off?

Speed and accuracy trade off because every extra moment spent inspecting a string raises the chance of catching a difference, so a person who moves faster accepts a higher risk of missing one, and a test that scores both makes that choice part of the score. The phenomenon has a name. Heitz (2014), in a review in Frontiers in Neuroscience, describes the speed-accuracy tradeoff as the tendency for decision speed to covary with decision accuracy, and notes that it appears from insects to rodents to primates. In the experimental literature it is mapped by changing the pressure on speed: with verbal instructions, with reward and penalty schemes, or with response deadlines.

An error checking test applies one of those pressures without saying so. The clock is the deadline, and the scoring rule is the payoff. If wrong answers cost nothing, guessing is cheap; if wrong answers cost points, it is not. SHL's fact sheet does not state its scoring rule, so we cannot tell a reader which applies to that test. The train driver assessment provider OPC gives the most useful direct advice in its candidate guide: avoid wild guessing, answer as many questions as you can in the time allowed, expect that you may not reach the end of every test, and "work as accurately and quickly as you can." That is advice to hold both goals at once, not to maximize one.

Heitz offers a point that matters for anyone reading a speeded score. Group means taken at a single speed setting, he writes, "provide only a snapshot." In an example he describes, from Heitz and Engle (2007), groups with high and low working memory did not differ in asymptotic accuracy; they differed in how quickly accuracy grew as response time lengthened. Translated to a checking test, two people with the same raw score can have reached it by different routes, one fast with some misses, the other slower and cleaner, and a single score cannot say which. The technical term for the extent to which a score depends on the rate of work as well as on correctness is speededness, and the Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) define it in those terms.

Two practical consequences follow. First, a strategy that works under one rule may fail under another, so read the instructions for what the test rewards and penalizes, and do not rely on a rule you remember from a different test. Second, a time limit is part of the measurement and not an inconvenience attached to it; the page on why IQ tests are timed explains why changing the limit changes the meaning of the number. Nobody can honestly tell a reader to "go fast" or "go slow" in general. The only defensible instruction is the one the test itself gives.

7 How Much Does Perceptual Speed Matter for the Job?

The evidence supports a bounded claim: perceptual speed matters most in routine, speeded, error sensitive work, but the studies that show it concern tasks and samples, and no source we opened shows what an error checking score predicts at a particular employer. The strongest statement in the sources comes from the Ackerman and Beier abstract quoted above, which ties perceptual speed measures to performance on tasks and jobs that need a high level of speed and accuracy. Their own data are two skill learning tasks, 4.67 and 10 hours of time on task, in samples of 117 to 167 people, and the abstract does not claim more.

The occupational database adds a map of where the ability is rated important. Perceptual speed is rated 63 out of 100 for data entry keyers and 72 for locomotive engineers, and the ability's ranking puts locomotive engineers fourth, behind air traffic controllers and pilots. Those ratings come from the database's own surveys of United States occupations. They tell a reader that comparing letters and numbers quickly and accurately is a recognized part of these jobs, which is a reason an employer might sample it. They do not tell a reader that an employer's cut score is justified, which is a separate question.

That separate question is the employer's to answer, and the Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) say how. Standard 11.1 asks that, before an employment test is developed and put to use, a clear statement of the intended interpretations of test scores for specified uses be made, and that the validation effort then be designed to determine how well this has been achieved for all relevant subgroups. For a candidate, the practical meaning is modest. The score you receive is a measurement of perceptual speed and accuracy in a short sample of work-like tasks, interpreted by the employer under its own validation, and it is not a measurement of your worth, your reasoning or your fitness for any job. The page on the cognitive ability test explains how a normed ability test differs from a screening hurdle.

Speed is also linked to the rest of cognition in adulthood. Salthouse (1996) proposed in Psychological Review that slower processing with age impairs other cognitive functions through a "limited time mechanism" and a "simultaneity mechanism," and reported considerable shared age-related variance across measures of speed and a large attenuation of age-related influences on cognitive measures after statistical control of speed. That is evidence about age differences in adult cognition, a point the section on age returns to, and not evidence that a checking test predicts work outcomes.

8 Can You Practice for an Error Checking Test, and What Does Retest Research Show?

Repeating a cognitive test raises scores by a modest amount on average, more when the practice comes with coaching or reuses the same form, so familiarity with the format is a fair preparation and memorizing material or hunting for answer keys is neither fair nor useful. The meta-analysis to know is Hausknecht and colleagues (2007), in the Journal of Applied Psychology. They write that as many as 25 to 50 percent of applicants in organizational and educational settings are retested with cognitive ability measures, and they summarize 50 studies, 107 samples and 134,436 participants, finding an adjusted overall practice effect of .26, larger when practice was accompanied by coaching and when identical forms were used. The abstract does not break the result down by type of test, so it does not give a figure for checking tests in particular, and we give none.

Searches for "error checking test practice," "free" practice and "examples with answers" mostly lead to sellers. A seller's page is a marketing description, not evidence of what an employer will set, and a set of invented questions with a key teaches the seller's items, not yours. We do not link sellers and we do not reproduce items. What the primary sources do offer is smaller and more reliable:

• The publisher's own fact sheet shows the layout and one worked example for the newer SHL version, and states that the correct option is the one identical to the target.
• The employer's invitation names the stages and often the tests, and it is the document that binds the employer.
• The assessment provider's guide for train driver candidates says that before each exercise a candidate "may have the chance to complete some examples," that the assessor can help with difficulty, and that questions must be asked before the timed part starts because no questions are allowed once it begins and the tests are done in silence.

The Standards add that policies on retesting "should be established by the test developer or user" and followed, and that they should be clearly communicated. For train driver candidates, those policies are the attempt rules discussed earlier, which differ by operator as published. The practical point is that an attempt used on an unfamiliar format is an attempt spent. Learning what the test asks, reading the instructions once, sleeping, and knowing how your input device behaves is legitimate preparation. The page on the pre-employment cognitive test covers the same ground for the wider category.

Taking Symbol Search or Coding in ACIS is not practice for an employer's checking test. The tasks differ from string comparison, ACIS makes no claim that its subtests resemble any employer's test, and an attempt on one is not a rehearsal for the other.

9 How Do Age, Sleep and Your Device Change a Speed Score?

Speed is the part of a cognitive profile most sensitive to age and to testing conditions, so a speed score is readable only against an age reference and in conditions you can describe. The age effect is the best documented. Salthouse (1996) hypothesized that increased adult age is associated with a decrease in the speed with which many processing operations can be executed. The American Psychological Association's Guidelines for Psychological Assessment and Evaluation (2020), which we read in a web archive capture of the APA's own PDF, make the same point as a rule for interpretation: "slowed processing speed is a normal part of cognitive aging," and so scores for older adults on tests that require fast performance would be read as impairment if norms for younger people were used. Guideline 12 asks psychologists to use age-appropriate norms. Ebaid and colleagues (2017) found large age differences on Symbol Search and Coding in their sample that did not disappear when hand dexterity was controlled.

For the reader, the implication is that "I was slower than the other applicants" and "I am slow for my age" are different statements, and that a norm-referenced speed score at your age answers the second. The page on how IQ changes with age explains why some abilities change across adulthood and others do not, and the page on the Processing Speed Index explains how a speed score is built and reported. Neither can say how a particular employer treats age.

Conditions matter too. The Standards list among the internal sources of random error "fluctuations in the level of an examinee's motivation, interest, or attention and the inconsistent application of skills," and the APA guidelines note that examinees may underperform for many reasons. Sleep, an unfamiliar input device, a small or delayed screen and interruptions are the ordinary examples for a timed task on a screen. The page on sleep and IQ test scores reviews the evidence on the first, and the page on taking an IQ test on a phone reviews what a touch screen adds to a timed task. We give no size for any of these effects here because we did not verify one for checking tasks.

10 How Do You Read a Speed Score?

Read a speed score as a rank against a stated reference group, with its uncertainty and its conditions, because a raw count of items correct in a short time means nothing until someone says whom it is compared with. A checking test produces a raw score, such as the number of questions answered correctly in the allowed time. SHL's fact sheet does not say how that count is converted or against which group, so a candidate who receives a percentile from an employer test cannot know the reference group unless the employer tells them. An adult normed battery states it: ACIS reports scaled subtest scores from 1 to 19 (mean 10, standard deviation 3), indices and the Full Scale IQ on a scale with a mean of 100 and a standard deviation of 15, percentiles and a 95 percent confidence interval, with adult norms for ages 16 to 90.

The scales are linked by simple arithmetic. A scaled score of 13 is one standard deviation above the mean, which is an index of 115, and under a normal curve that sits near the 84th percentile (our arithmetic, not a published ACIS figure). Percentiles and standard scores stretch differently, which is why the page on IQ score versus percentile explains why they cannot be averaged, and the page on why the standard deviation is 15 explains the scale itself. The page on how IQ scores are normed describes what a norm group is and why a score is only as good as the group behind it.

The uncertainty needs its own sentence. The confidence interval reported with a processing speed score is a band in which the person's standing probably lies, and two scores whose bands overlap are not reliably different. For speeded tests there is a further trap that the Standards for Educational and Psychological Testing name directly: when a test is designed to reflect rate of work, internal consistency estimates of reliability, particularly by the odd-even method, are likely to yield inflated estimates for highly speeded tests. A reliability figure for a speed test is therefore only as honest as the method behind it, and a reader should look for retest or alternate form evidence. The page on reliability and validity gives the general picture, and the ACIS documentation for its own scores is in the technical manual.

Finally, a speed score is a sample of a narrow ability, not a verdict. Two subtests give a Processing Speed Index, and a result that is high or low on speed alone says little about reasoning, knowledge or memory, which sit in other indices. The page on a normed processing speed test shows what a full speed assessment looks like and how to read it beside the rest of a profile, without repeating that material here.

11 What Does an Unsupervised Online Session Need?

An unsupervised session hands the test taker every condition an examiner would control, so for a timed speed task the reader has to supply a quiet room, a familiar input device, a screen large enough to see the whole task, and an uninterrupted two minutes. The Standards are explicit about the risk. A comment to Standard 3.4 says that "unproctored test administrations where standardization cannot be ensured" could provide an advantage to some test takers over others, and that in such situations results should be interpreted with caution. A separate comment says the interpreter of the results should be informed if a test was unproctored. SHL's newer Checking test is designed for unproctored use and its older sheet lists a verification test, which is how one publisher handles the same concern.

ACIS is online and unsupervised, and its fact sheet is plain about what that means. The Full Scale form takes about 175 minutes, breaks are allowed, progress is saved between subtests and a buyer has 30 days to complete it. Symbol Search carries 80 puzzles with a 2 minute limit, and Coding gives 120 seconds. Three ACIS subtests present items as audio and need working sound, Digit Span, Alphanumeric Sequencing and Arithmetic, and neither speed subtest is among them. For a speed task the preparation is mundane: close notifications, use the device you normally use, read the instructions once, and do not start when tired or in a hurry. The page on the free IQ test describes what the trial includes before any money changes hands.

12 Where ACIS Sits, and What a Buyer Should Do

ACIS is a normed online battery for an adult who wants to see their own processing speed, and the rest of a profile, on adult norms; it has no string comparison task, it does not prepare for or predict any employer test, and it is not an employer's instrument. The strengths are concrete. It reports a Processing Speed Index from two subtests, Symbol Search and Coding, with a percentile and a 95 percent confidence interval, and the Full Scale form adds the other five indices and a Full Scale IQ. The free trial of the Full Scale form opens five subtests, including Coding and Symbol Search, with no card, and finished trial subtests are kept if the person later unlocks a form that includes them. Prices are one time and were read on October 29, 2026: Quick 15 dollars, Optimized 30 dollars, Full Scale 50 dollars, Custom Test 5 dollars per subtest. The refund policy 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, not an unconditional one.

The limits are just as concrete. ACIS is online and unsupervised, it is not a clinical or diagnostic instrument, and it is in English only. The ACIS page for researchers says it "is not intended for clinical diagnosis, hiring decisions, accommodation determinations or admission to high IQ societies," and the page on ACIS for research sets out where it does fit. A report from ACIS is for the person who takes it. It is not a document to send to an employer, and it is not a substitute for any test an employer sets. Speed also carries the limits discussed above: it is sensitive to age, device and conditions, and two subtests are a narrow sample.

The Standards for Educational and Psychological Testing (AERA, APA and NCME, 2014) are the yardstick this page tries to meet, not an endorsement of ACIS. Standard 1.0 asks that each intended score interpretation for a specified use be clearly articulated and supported by validity evidence, and Standard 1.4 says that if a score is interpreted for a use that has not been validated, the user must justify the new interpretation. The APA's Guidelines for Psychological Assessment and Evaluation (2020) say that validation evidence primarily addresses the stated purposes of the test, and that when a test is used for purposes that differ from those the developer investigated, psychologists are encouraged to evaluate the validity evidence for that specific use. Read this way, a processing speed score from ACIS supports the statement "this is where I stand on adult norms in these two tasks," and does not support "this is how I will do on that employer's test."

A reader who wants to act on this page can do it in order:

1. Ask the employer what the test is. Read the invitation, note the stages, the time limits and the attempt rules, and take them from the operator or employer, not from a general page.
2. Use legitimate preparation. Read the instructions, sleep, check your input device and, if the employer sends familiarization material, use that. Do not buy a key to items you cannot be sure are real.
3. Decide whether you want your own profile. If you are curious about your processing speed on adult norms, the free trial shows the format before anything is spent, and the technical manual documents the scoring.
4. Pick the form that fits. Symbol Search and Coding are in the free trial and in Optimized; Custom Test lets you choose them alone; Full Scale adds the other indices.
5. Read the result as one source. Keep the confidence interval in view and do not use the number for a decision it cannot support.

13 Sources Behind This Page

Every figure above is traceable to one of the following, and each is linked at the point where it is used. Pages were read on October 29, 2026, prices can change, and any figure we derived ourselves is labeled in the text as our arithmetic.

• SHL. Verify Checking Test (Next Generation), Test Fact Sheet, and SHL Verify Checking Test (Current Generation), Assessment Fact Sheet. One page documents each, with a 2018 copyright line. Format, times, question limits and job titles.
• Transport for Wales. Drivers. Careers page, undated. The online error checking test, the assessment centre stages and the attempt rules.
• London North Eastern Railway. Our Apprentice Driver application process. Careers page with a 2026 copyright line. The timed Detail Checking Test.
• Avanti West Coast. Train driver recruitment. Page stating it was last updated on January 23, 2025. Stages, tests named and the lifetime attempt rule.
• The Occupational Psychology Centre. Train Driver Assessment: A guide for candidates who undertake their assessment with The OPC. Candidate guide dated December 4, 2024, copyright September 2024. Exercises listed, advice on accuracy and speed, who sets the rules.
• Rail Safety and Standards Board. RSSB makes train driver recruitment process more efficient and effective. News page of January 13, 2025, on RIS-3751-TOM Issue 4.
• O*NET Resource Center, United States Department of Labor. Perceptual Speed, Data Entry Keyers (43-9021.00) and Locomotive Engineers (53-4011.00). Ability definition, importance scores and ranking; occupation pages updated 2026.
• Pearson Assessments. Wechsler Adult Intelligence Scale, Fifth Edition (WAIS-5) product page. Age range, administration times, qualification level and publication year.
• Ackerman P, Beier M. Further explorations of perceptual speed abilities in the context of assessment methods, cognitive abilities, and individual differences during skill acquisition. Journal of Experimental Psychology: Applied, 2007, volume 13, issue 4, pages 249 to 272.
• Ebaid D, Crewther S, MacCalman K, Brown A, Crewther D. Cognitive Processing Speed across the Lifespan: Beyond the Influence of Motor Speed. Frontiers in Aging Neuroscience, 2017, volume 9, article 62.
• Heitz R. The speed-accuracy tradeoff: history, physiology, methodology, and behavior. Frontiers in Neuroscience, 2014, volume 8, article 150.
• Salthouse T. The processing-speed theory of adult age differences in cognition. Psychological Review, 1996, volume 103, issue 3, pages 403 to 428.
• Hausknecht J, Halpert J, Di Paolo N, Moriarty Gerrard M. Retesting in selection: A meta-analysis of coaching and practice effects for tests of cognitive ability. Journal of Applied Psychology, 2007, volume 92, issue 2, pages 373 to 385.
• Buros Center for Testing. Minnesota Clerical Test. Test review listing, University of Nebraska, with the out of print note.
• American Educational Research Association, American Psychological Association and National Council on Measurement in Education. Standards for Educational and Psychological Testing, 2014. Standards 1.0, 1.1, 1.4, 3.4 and 11.1, the definition of speededness, and the passages on reliability of speeded tests, sources of random error and retesting, read in the open access edition.
• American Psychological Association. APA Guidelines for Psychological Assessment and Evaluation, 2020, Guidelines 5, 8 and 12. The apa.org site blocked direct fetches, so the document was read from a web archive capture of that same address.

14 Frequently Asked Questions