- Understanding the AON Modular Battery
- All 12 Content Areas at a Glance
- Domains 1-6: The scales Ability Modules
- Domains 7-10: The smartPredict Gamified Challenges
- Domains 11-12: Situational Judgment and Personality
- Who Actually Faces These Domains
- Scheduling Your Prep Around the Domains
- Invitation Windows, Fees, and Retakes
- Frequently Asked Questions
- Aon Assessment's battery is drawn from three families: scales ability tests, smartPredict challenges, and behavioral instruments.
- There are 12 named modules, from scales verbal (47 questions, 12 minutes) to ADEPT-15 (20-23 minutes).
- Every smartPredict item generates at run time, so no two candidates see an identical test.
- There is no fixed passing score - each employer sets its own percentile benchmark against norm groups.
Understanding the AON Modular Battery
Aon Assessment is the testing business Aon plc built after acquiring the Hamburg-based company cut-e in May 2017. If your invitation email or job advert still references "cut-e," you're looking at the exact same tests under a legacy brand name. There is no separate credentialing body behind that older label - it's the identical platform, identical scoring logic, and identical 12 content areas covered in this guide.
Unlike traditional certification exams, Aon doesn't route candidates through Pearson VUE, PSI, or Prometric. Aon administers everything itself, directly through its own browser-based platform, and only on employer invitation. That structure matters for how you prepare: you can't register on your own, there's no candidate fee because the hiring organization licenses the assessment, and your invitation window is typically five to ten days from the moment the email lands. If you want the full mechanics of how that invitation-to-completion process works, see AON Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Employers don't run all 12 domains on every candidate. Instead, they assemble a custom battery from the three families - scales, smartPredict, and behavioral - chosen to match the role. A graduate finance program might lean heavily on scales verbal and scales numerical, while an operations role might add gridChallenge or motionChallenge to probe working memory and planning. Understanding which family each domain belongs to is the single most useful mental model for prepping efficiently, which is why we break the guide down that way below.
All 12 Content Areas at a Glance
Every module in the Aon suite has a published time limit and, in most cases, a fixed or adaptive question count. Below is the full inventory. Note how short most modules are - this brevity, not length, is what makes the suite demanding, a point covered in depth in How Hard Is the AON Exam? Complete Difficulty Guide 2026.
| # | Module | Domain Focus | Format / Time |
|---|---|---|---|
| 1 | scales verbal | Verbal reasoning | 47 questions / 12 minutes |
| 2 | scales numerical | Numerical reasoning | 37 questions / 12 minutes |
| 3 | scales cls | Inductive-logical reasoning | 12 tasks / 12 minutes |
| 4 | scales ix | Inductive reasoning | 20 questions / 5 minutes |
| 5 | scales eql | Basic numeracy | 5 minutes |
| 6 | scales lt | Language skills | 10 minutes |
| 7 | switchChallenge | Deductive reasoning | 6 minutes |
| 8 | gridChallenge | Working memory | 9 tasks / 9 minutes |
| 9 | motionChallenge | Complex planning | 6 minutes |
| 10 | digitChallenge | Numeracy | 5 minutes |
| 11 | chatAssess | Situational judgment | 15 minutes |
| 12 | ADEPT-15 | Adaptive personality | 20 min test / 23 min with instructions |
A few additional modules exist beyond this core 12 - scales verbal instruct (24 questions, 8 minutes), mechanical reasoning (24 questions, 15 minutes), and clx (6 minutes) among them - but the twelve above form the domains most employers draw from and the ones this guide focuses on.
Domains 1-6: The scales Ability Modules
The "scales" family is Aon's core cognitive ability line, and it's where most preparation time should go. These modules are heavily timed, and Aon's own design intent is clear: the extreme time pressure, under which most candidates cannot reach half the items, is the defining difficulty of the entire suite.
Domain 1: scales verbal
Verbal reasoning delivered as 47 questions in 12 minutes - roughly 15 seconds per item. Statements are typically evaluated as true, false, or cannot say based on a short passage.
- Practice reading passages fast and extracting only the claim being tested
- Avoid re-reading the full passage for every question - skim for the relevant sentence
Domain 2: scales numerical
37 questions in 12 minutes, drawing on tables, charts, and ratios. Along with scales verbal, this carries the heaviest volume in graduate and financial-services hiring.
- Drill percentage, ratio, and rate-of-change calculations until they're automatic
- Learn to estimate rather than calculate exactly when the answer choices are far apart
Domain 3: scales cls
Twelve inductive-logical reasoning tasks in 12 minutes - one minute per task on average. Candidates identify the rule governing a sequence or matrix of shapes.
- Look for rotation, reflection, and addition/subtraction-of-elements patterns first
- Don't fixate on one rule type; several may combine in a single item
Domain 4: scales ix
20 questions in just 5 minutes - 15 seconds per item. A pure inductive reasoning module, often testing pattern completion under tighter time pressure than scales cls.
- Trust first-pass pattern recognition rather than second-guessing
- Skip and return rather than stalling on one visually complex item
Domain 5: scales eql
A short, 5-minute basic numeracy check, often used as a screening layer before or alongside scales numerical.
- Focus on speed with arithmetic fundamentals: fractions, decimals, basic algebra
- Treat it as a warm-up module rather than a place to overthink
Domain 6: scales lt
A 10-minute language skills module assessing grammar, vocabulary, and comprehension mechanics rather than reasoning from passages.
- Review common grammar and usage rules relevant to the test language
- Useful for roles with heavy written-communication requirements
Domains 7-10: The smartPredict Gamified Challenges
The smartPredict family swaps traditional multiple-choice questions for short, game-like tasks. Every smartPredict item is generated at run time, which is Aon's stated method for controlling cheating in unsupervised administration - meaning no two candidates, even siblings taking the same battery back to back, see an identical version of the test.
Domain 7: switchChallenge (deductive reasoning)
A 6-minute task built around following changing rules or switching conditions, testing how well candidates apply logic that updates mid-task.
- Practice holding one rule in mind while a second rule is introduced
- Expect the rule-set to shift without warning between rounds
Domain 8: gridChallenge (working memory)
Nine tasks in 9 minutes, asking candidates to track and recall positions or sequences on a grid.
- Build short-term visual recall through repeated grid-based practice tasks
- Chunk information into small groups rather than trying to memorize the whole grid at once
Domain 9: motionChallenge (complex planning)
A 6-minute module that requires planning a sequence of moves or actions toward a goal state, similar in spirit to a puzzle-solving task.
- Think several steps ahead before committing to a first move
- Practice tasks that reward planning over trial-and-error clicking
Domain 10: digitChallenge (numeracy)
A fast, 5-minute numeracy challenge presented in a gamified format rather than a standard question list.
- Keep mental math fast and accurate; there's little time for written workings
- Treat it as a speed drill, not a deep-calculation exercise
Because these modules are generated dynamically, memorizing specific answers is impossible and pointless. The better strategy is familiarizing yourself with the task type and interface using Aon's own free practice platform, Aon TestIt, alongside the practice tasks and screencast videos on Aon's Prepare for your Online Assessment page. Our own AON Study Guide 2026: How to Pass on Your First Attempt walks through how to structure that practice before your invitation window opens.
Domains 11-12: Situational Judgment and Personality
The final two domains move away from timed cognitive puzzles and into how you communicate and behave under realistic conditions.
Domain 11: chatAssess (situational judgment)
A 15-minute module built as a simulated conversation, presenting workplace scenarios where candidates choose or type responses reflecting judgment and communication style.
- Respond the way you genuinely would on the job, not how you think sounds best
- Watch for scenarios testing customer-service tone, escalation judgment, and professionalism
Domain 12: ADEPT-15 (Adaptive Employee Personality Test)
20 minutes of test time, or 23 minutes including instructions, delivered adaptively - meaning later statements are selected based on earlier answers.
- Answer consistently rather than trying to guess a "correct" personality profile
- Because it's adaptive, contradictory answers are more detectable than in a fixed-form questionnaire
Key Takeaway
There's no universal passing score across any of these 12 domains - scoring is percentile-based against norm groups, and each employer sets its own benchmark. Retake windows are also set by the employer, not by Aon. For the full explanation, see AON Passing Score 2026: Exactly What You Need to Pass.
Who Actually Faces These Domains
Aon's clients span graduate schemes, financial services, contact centers, technical and engineering pipelines, and operations roles across roughly 90 countries and more than 40 languages. The specific mix of domains you'll face depends entirely on the role you've applied for:
- Graduate and financial-services roles typically emphasize scales verbal and scales numerical, given their heavy volume in that hiring segment.
- Operations, logistics, and technical roles often add smartPredict modules like gridChallenge or motionChallenge to probe working memory and planning under pressure.
- Customer-facing and service roles are more likely to include chatAssess for situational judgment.
- Most professional and managerial batteries include ADEPT-15 as a personality layer regardless of the cognitive modules selected.
If you're unsure whether the invitation you received is even genuinely from Aon Assessment rather than another credential sharing the same acronym, our explainer on What Is AON? and the related piece on AON Meaning clarify the distinction before you start prepping the wrong material.
Scheduling Your Prep Around the Domains
Because invitation windows typically run only five to ten days, there's rarely time for a leisurely, months-long study plan. Instead, sequence your limited days around the domains most likely to appear in your specific battery.
Diagnose and orient
- Confirm which modules your invitation email references
- Run through Aon TestIt to see live examples of scales and smartPredict formats
Drill the heaviest-weighted modules
- Prioritize scales verbal and scales numerical if your role is graduate or finance-track
- Time every practice set to the real limits - 12 minutes for verbal, 12 minutes for numerical
Cover the smartPredict and behavioral layers
- Get comfortable with gridChallenge, switchChallenge, or motionChallenge task mechanics
- Read through chatAssess scenario examples and clarify how you'd respond authentically
Consolidate, don't cram new content
- Review the screencast videos on Aon's official Prepare page one more time
- Rest - fatigue hurts speed-based scales modules more than any other factor
This compressed timeline is why targeted, domain-specific practice beats generic test prep. For a broader walkthrough of technique beyond scheduling, see AON Study Guide 2026: How to Pass on Your First Attempt, and for a fast pre-test review, use AON Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Invitation Windows, Fees, and Retakes
A few structural facts change how you should approach any of the 12 domains:
- No candidate fee. The hiring employer licenses the assessment from Aon; you never pay to sit any module.
- No third-party test center. Everything runs on Aon's own browser-based platform - there's no Pearson VUE, PSI, or Prometric booking involved.
- Employer-set retakes. If you're allowed to retake a module, the window and eligibility are decided by the employer, not by Aon itself.
- Adaptive delivery. Several modules, including ADEPT-15, adjust based on earlier responses, and every smartPredict item is generated fresh at run time.
You can review the full mechanics of eligibility and access in AON Requirements 2026: Eligibility, Prerequisites & How to Qualify, and since there's no candidate-paid fee structure at all, our AON Certification Cost 2026: Complete Pricing Breakdown piece explains exactly how the employer-licensing model works in practice. Once you're comfortable with the domain list, running full-length, timed practice sets on our practice test platform is the fastest way to convert this knowledge into real speed under pressure - the same kind of speed you'll need across all six scales modules and all four smartPredict challenges.
Frequently Asked Questions
No. Employers assemble a custom battery from the scales, smartPredict, and behavioral families based on the role, so most candidates see only a subset of the 12 domains covered here.
No. Scoring is percentile-based against norm groups, and each employer sets its own benchmark rather than Aon applying a universal cutoff.
Not the exact items - every smartPredict item is generated at run time, so no two candidates see the same version. You can, however, practice the task type on Aon TestIt.