Assessment centres: what happens, and who actually runs them
Half a day to a full day at the employer's office or on a video call, running three to five exercises with assessors watching. We counted how many UK graduate adverts mention one: 562 of 12,914, and whether you meet one depends enormously on the sector you are applying to.
12,914 adverts countedCounted 5 November 2026Free to cite, with a link
Who runs them, by sector
Finance adverts mention an assessment centre 9.5 times as often as Education ones. If you are applying across sectors, this is the difference between a process you should prepare a whole day for and one you probably will not meet.
| Sector | Assessment centre | Aptitude tests | Adverts |
|---|---|---|---|
| Finance | 7.6% | 2.9% | 969 |
| Accounting | 6.7% | 0.2% | 610 |
| Consulting | 6.7% | 4.1% | 507 |
| Data | 6.6% | 0% | 695 |
| Engineering | 4.7% | 0.5% | 3,219 |
| Technology | 4.6% | 0.3% | 1,530 |
| Construction | 4.2% | 0.9% | 575 |
| Supply Chain | 4% | 0.4% | 554 |
| Marketing | 2.8% | 0.2% | 1,124 |
| Retail | 2.5% | 0.4% | 552 |
| Healthcare | 1.4% | 0% | 501 |
| Business | 1.1% | 0.9% | 1,025 |
| Education | 0.8% | 0% | 392 |
Read these as a comparison, not as rates — see the method below.
You are almost certainly not competing with the others
Most assessment centre advice is written as though the day ranks candidates and the best few are hired. For most graduate schemes that is not how it works. The exercises are scored against a standard, and an employer filling sixty places from four hundred applicants will take everyone who clears the bar at the centre.
That reverses what you should do in a group exercise. If the day were a competition, dominating it would make sense. Because it is not, helping someone else contribute scores on your sheet, not theirs — "brings in quieter members" is a line assessors are looking to tick, and talking over people is a tickable negative.
It is worth checking rather than assuming: some employers do run a ranked day. Ask the recruitment contact how the scoring works. Most will tell you, and almost nobody asks.
The five exercises, and what each one scores
Group exercise
Six to eight candidates are given a scenario and a decision to reach in thirty to forty-five minutes — allocate a budget, choose between four projects, respond to a crisis. Two assessors watch and say nothing.
Scored on: Whether the group reached a decision, and what you did to get it there. The sheet has lines like “builds on others’ contributions”, “manages time”, “brings in quieter members”.
The usual way to lose marks: Treating it as a competition. The loudest person in a group exercise almost always scores badly, because talking over people is a tickable negative and nobody is marked for airtime. Asking the person who has not spoken what they think scores on two indicators at once.
In-tray or e-tray exercise
You are given an inbox — twenty emails, conflicting priorities, a meeting in an hour — and asked what you would do with each and in what order, usually with a written justification.
Scored on: Prioritisation and the reasoning behind it. Assessors are looking for whether you spotted the one genuinely urgent item and whether you delegated or deferred the rest rather than attempting everything.
The usual way to lose marks: Trying to finish. Most in-trays are deliberately impossible in the time given. Clearing twelve items badly scores below handling six with a stated reason and saying what you would do with the rest.
Case study and presentation
A pack of information — a company, some figures, a decision — with thirty to sixty minutes to prepare a recommendation, then five to ten minutes presenting it to one or two assessors who ask questions.
Scored on: That you reached a recommendation and can defend it. The analysis matters less than most candidates assume; assessors are checking whether you can commit to an answer under scrutiny.
The usual way to lose marks: Presenting the analysis instead of the recommendation. Lead with what you would do, then the two or three reasons. A presentation that reaches its conclusion in the last thirty seconds has spent the whole slot on the part nobody was scoring.
Competency or strengths interview
A one-to-one or two-to-one interview, usually thirty to forty-five minutes, run as part of the day rather than separately.
Scored on: The same behavioural indicators as any competency interview, from your own examples.
The usual way to lose marks: Reusing the group exercise you have just done as your teamwork example. The assessors watched it and will have their own view, which is a risk you do not need to take when you arrived with five prepared stories.
Written exercise
A short report, email or summary written under time pressure — commonly a reply to a difficult client, or a one-page brief from a pack of material.
Scored on: Structure and audience. Whether the first paragraph says the thing, and whether the register suits who it is addressed to.
The usual way to lose marks: Writing it like an essay. A brief for a busy reader puts the answer first; a 300-word build-up to a conclusion scores badly however well written it is.
Preparing for one
1. Ask what the day contains
Email the graduate recruitment contact and ask for the format. Almost everybody is too polite to, and almost every employer will tell you — they are not trying to surprise you, and knowing there is a written exercise changes what you practise.
2. Re-read the advert and the competency framework
The exercises are scored against the same competencies the advert named. Large employers often publish their framework on the careers site; if they do, it is effectively the mark scheme.
3. Bring five prepared stories, not twenty
The interview inside the day is a competency interview like any other. Five rich situations covering eight competencies is the preparation, and it is the same set you would use anywhere.
4. Practise finishing, not starting
In the group exercise and the presentation, candidates run out of time before reaching a decision. Time yourself reaching a recommendation with ten minutes to spare, because an unfinished exercise cannot be marked on its conclusion.
5. Eat something and plan to be dull about logistics
These days run six to eight hours and performance drops. Know where it is, arrive early, and take water. It is not advice anybody enjoys reading and it accounts for more bad afternoons than nerves do.
Virtual assessment centres
Most of the above is unchanged. The exercises are the same and the sheets are the same. Three things do differ.
Turn-taking breaks. On a video call people cannot read the small cues that stop two people starting at once, so group exercises stall or collapse into interruption. Saying "shall we go round once?" in the first minute is worth more on a video call than it ever is in a room, and it scores.
You can have notes. Nobody can see your desk. Have the competency framework and your five stories on paper beside you.
The logistics are the risk. Test the platform beforehand, use a wired connection if you have one, and have the recruiter's phone number written down. Assessors are understanding about technology failing and cannot score an exercise you missed.
Method, and what these numbers are not
We read UK employers' own careers pages every night. On 5 November 2026 we searched 12,914 live graduate, placement, internship and apprenticeship adverts for mentions of an assessment centre, assessment day, or aptitude and psychometric testing.
These are floors, and a long way below the real rates. Only 22% of adverts describe their selection process at all, and of those only about a quarter name a specific stage. An employer who runs an assessment centre without mentioning it in the advert is counted here as not running one, so 4.4% is not an estimate of how many employers use them — it is how many say so.
The comparison between sectors is the part that holds. The same undercounting applies to every sector, so Finance mentioning assessment centres 9.5 times as often as Education is a real difference even though both figures understate reality.
Everything else on this page — the exercises, what each scores, the traps — is judgement and experience rather than measurement, and is written as such.
Getting invited is the hard part
An assessment centre is the fourth stage of a process that starts with an application nobody read. Gradovio ranks every live graduate role against your CV, writes the CV and cover letter against the specific advert, and fills the form — so the effort goes into the days you get invited to.
Start a free trial — 13,279 live graduate roles to point it at.
Next: the competency interview inside the day, and everything else.