What happens at an assessment centre?
An assessment centre is a structured selection event, usually half a day to two days, where candidates complete several different exercises while being observed by trained assessors. It is common for graduate schemes and management roles.
Why employers use them. A single interview predicts performance poorly. Assessment centres apply multiple methods to multiple candidates across multiple assessors, scoring against defined competencies — which substantially improves reliability and is more defensible if a decision is challenged.
The usual exercises:
Group exercise. A team task or discussion, often with a scenario and limited time. The common misconception is that this tests dominance. It does not — assessors typically score contribution, listening, building on others' ideas, involving quieter members, and moving the group toward a conclusion. Talking over people reliably scores badly, and so does saying nothing.
In-tray or e-tray exercise. A simulated inbox of competing demands to prioritise and act on under time pressure. This assesses judgement, prioritisation and written communication.
Case study and presentation. Analysing material and presenting recommendations, sometimes with questions afterwards. The analysis usually matters more than the delivery polish.
Competency or strengths interview, often structured around the same framework being scored elsewhere.
Psychometric tests, sometimes verifying results from an online sift.
Role play, with an actor playing a difficult customer or colleague.
Social elements — lunch, a dinner, informal time with current employees. These are typically not formally assessed, though behaving badly will be noticed.
What actually matters:
You are scored against a framework, not ranked against each other in most designs — several candidates can pass.
Each exercise is scored independently, so a weak start does not carry over.
Read the competencies in the invitation; they tell you exactly what is being measured.
Ask about adjustments in advance if you need them.