AON scales ix (Discover Rules): the complete 2026 guide

AON’s scales ix (branded “Discover Rules”) is an inductive-logical reasoning test built on one repeated task: you see nine objects, all but one obey a hidden rule, and you pick the object that breaks it. You do that 20 times in 5 minutes. This guide explains the format, every rule family with worked visual examples, how it’s scored, and how it differs from the other cut-e tests. You can practise a full test free on forge. New to the provider? Start with the AON (cut-e) assessments overview.

Source note: forge checks this against AON’s official Practice Tasks — scales ix document and Aon’s assessment preparation page. AON, cut-e and scales are trademarks of Aon plc; forge is independent and not affiliated.

Quick summary

• Each question shows nine objects; exactly one breaks the governing rule and you select it.
• 20 items in 5 minutes, one correct answer each, difficulty rising as you go.
• It is non-verbal: the “rule” is about shape, count, fill, rotation, position or nesting.
• The odd one is designed to blend in; it is rarely just the one that looks different.
• Preparation is pattern-library plus a fixed scanning routine, drilled under the clock.

What is the cut-e scales ix test?

scales ix is one of AON’s cut-e scales aptitude tests. It is an abstract (non-verbal) reasoning measure: no words, and no numbers to calculate, just a visual field of shapes, symbols and lines with one rule running through it. AON describes it as measuring your aptitude for logical reasoning: analyse a situation, determine the rule, apply it. Because it is language-free, employers use it as a fairer signal of fluid reasoning across a diverse graduate pool, and cut-e tests are common in graduate hiring across banking, consulting and FMCG.

How the scales ix test works

Every item is the same shape. You are shown an image of nine objects. Eight of them share one governing rule; the ninth does not. You click the object that breaks the rule. There is exactly one correct answer per item, and AON recommends working through the 20 items in the order given, because they climb in difficulty.

The rule families you’ll see

The whole test is one skill, rule discovery, but the rules cluster into a handful of families. AON’s own worked examples demonstrate five of them. Learn to test each of these on sight and most items fall in seconds.

1. Side count

Every object has the same number of sides; the odd one has a different count.

2. Rotation

A shape rotates by a fixed step across the objects; the odd one is turned the wrong way or by the wrong amount.

3. Containment

Each object holds a second shape entirely inside it; the odd one’s inner shape crosses or sits outside the border.

4. Count / repetition and 5. Alternation

Two more families appear constantly. In a count rule, a feature repeats on a cycle (one line, one line, two lines) and the odd object shows the wrong number. In an alternation rule, a property flips in a fixed order (filled, outline, filled), and the odd object is out of phase.

How scales ix is scored

Your score is essentially how many objects you correctly identify in the time. AON’s own material frames it as working quickly and accurately to get as many right as possible; it does not describe a penalty for wrong answers. That matters for strategy: the myth that scales ix punishes guesses leads people to freeze on hard items. The better habit is simply not to stall: if the rule won’t surface, move on and use any spare time to return. Employers then read your result as a percentile against a norm group and set their own cut-score.

scales ix vs the other cut-e scales tests

AON’s cut-e suite has several logic tests, and they are easy to confuse. scales ix is the odd-one-out format; the others change the task.

If your invite mentions “Discover Rules” or scales ix specifically, this is the odd-one-out format. For the code-rearrangement game, see the AON Switch Challenge guide.

How to prepare for scales ix

The test rewards a library of rules plus a fast, repeatable scan. A practical plan:

1. Learn the rule families. Side count, rotation, count/repetition, containment, alternation, then the harder relational rules: nested order, symbol-to-position, and comparative counts.
2. Scan with a fixed checklist. For each object, test one attribute at a time (sides, fill, rotation, count, position, nesting) rather than staring at the whole grid.
3. Distrust the odd-looking one. The answer is camouflaged; the visually loudest object is often a decoy.
4. Train under the clock. Build the scan with no timer, then practise at the real ~15-seconds-per-question pace.
5. Skip and return. Don’t stall; move on and revisit with spare time.

Related guides

• AON (cut-e) assessments: the overview
• AON Switch Challenge: the complete guide
• Abstract reasoning: patterns and rules
• Logical & abstract reasoning skills
• Psychometric tests: the overview

Frequently asked questions