A two-minute test about staying focused and reacting quickly. Very little is published beyond that, and this guide says so rather than filling the gaps.
Aon lists Ability to Concentrate (e3+) as a 2-minute test that measures your aptitude to concentrate over time and act quickly when faced with certain signals. Aon does not publish the screen design, the signals, or the scoring rules, so those details are not publicly confirmed.
| Topic | Status as of 12 October 2026 |
|---|---|
| Time limit | 2 minutes (Aon candidate page). |
| Skill measured | Concentrating over time and reacting quickly to certain signals (Aon candidate page). |
| Type of signals | Not publicly confirmed. |
| How you respond | Not publicly confirmed. |
| Speed versus accuracy balance | Not publicly confirmed. |
| Official sample items | None listed on the candidate page. |
| Benchmarks or norms | Not publicly confirmed. Employers decide how results are used. |
This is a short test, and a short, simple test is easy to describe wrongly. We prefer to keep to the published sentence rather than invent a screen.
Psychologists describe sustained attention as keeping a steady level of alertness over a stretch of time, particularly when little is happening. Reaction to signals adds a second element: you must notice the signal quickly and respond without being drawn into false alarms.
Two kinds of error therefore matter in tasks of this kind. A miss is a signal you did not react to. A false alarm is a response to something that was not a signal. Aon's statement that points are usually deducted for incorrect answers on performance tests is a reminder that reacting to everything is not a safe plan. How this applies to e3+ itself is not confirmed.
Because the test lasts only two minutes, there is no room to recover from a slow start. Preparation is mostly about arriving alert and having understood the instructions.
This drill trains the same habit of watching a stream and reacting to a rule. It is our own exercise and does not reproduce the real task.
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Do the drill for two minutes with a fresh string each time. Track your misses and false alarms separately, since they point to different problems: slow reading or over-eager reacting.
Should your invitation also include a questionnaire about working style, ReasonEra does not cover it.
Being straightforward about it: a real-time reaction test is not something a screenshot tutor can simulate, and ReasonEra does not claim to. If your Aon battery sits alongside numerical, verbal or logical reasoning, those parts are where ReasonEra helps. Practise a few questions, review the step-by-step reasoning, and keep your focus drill separate.
A free account includes 3 free trials, and a 14-Day Pass costs 49 € for unlimited use for 14 days. The free practice tests below are a sensible way to build concentration across longer timed sets.
Hiring processes are revised from year to year, so treat the invitation you receive as the authority.
This tool is meant for the weeks before an assessment, but many employers prohibit outside help during a live assessment, so treat it as practice and not as a way around the test.
It is the Ability to Concentrate test on Aon's candidate page. It lasts 2 minutes and measures your aptitude to concentrate over time and act quickly when faced with certain signals.
Aon lists 2 minutes to complete. The number of signals or tasks is not stated.
Aon does not publish what the signals look like, so this is not publicly confirmed. Read your invitation and the untimed introduction closely.
You can build general sustained-attention habits with timed drills and by working in quiet, distraction-free slots. There is no official sample item for e3+ on Aon's candidate page.
Aon says that on performance tests points are usually added for correct answers and deducted for incorrect ones. Whether and how that applies to e3+ is not publicly confirmed.
Upload it, read the explanation, and try a similar one yourself. The free trials cover your first few.
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Notes. The details above were taken from pages anyone can read, listed in the sources section. The organisations named are not connected to ReasonEra.