Competency-based interviews, explained
A competency-based interview is a structured interview in which each question targets a named behaviour — teamwork, problem solving, resilience — and your answer is scored against that behaviour using evidence from things you have actually done.
Written by Ace Editorial · Published 23 September 2026 · Last updated 23 September 2026
How does a competency-based interview work?
The interviewer works through a fixed list of competencies, asks a past-behaviour question for each, and scores your answer against written criteria.
Because the questions and the scoring are fixed, the interview is usually consistent between candidates — which is why public sector employers, graduate schemes and large professional services firms use it.
It also means the interviewer is listening for specific things. Vague answers score badly even when the story is impressive.
What competencies do employers usually assess?
Most lists are a variation of the same eight: teamwork, communication, problem solving, planning and organising, resilience, adaptability, leadership and customer focus.
The job description will usually tell you which ones apply. Where it lists behaviours rather than tasks, those are your competencies.
How do you answer competency questions?
With one specific event, structured as situation, task, action and result, spending most of your time on what you personally did.
The most common scoring failure is describing what a team did. Interviewers are scoring you, so "we decided" needs to become "I proposed, and the team agreed because".
Example
"Our onboarding took eleven days and we were losing customers in week two (situation). I owned the fix (task). I mapped every step, cut two approvals and rewrote the welcome email sequence (action). It came down to four days and week-two drop-off halved over the next quarter (result)."How long should a competency answer be?
Ninety seconds to two minutes. Long enough for a complete example, short enough that the interviewer can still score it.
What if you do not have an example?
Use the closest real thing — a smaller version, a different context, or something from outside work — and say what you would do now. Never invent an example.
Interviewers probe. An invented example collapses on the second follow-up question, and it costs you more than the missing competency ever would.
Frequently asked questions
- What is the difference between a competency and a behavioural interview?
- In practice they are the same technique. "Competency-based" usually implies a formal scored framework, common in the UK public sector and large employers.
- How many competency questions will I get?
- Typically four to eight in a forty-five to sixty minute interview, one per competency, each with follow-up probes.
- Can I reuse the same example twice?
- Once is fine if it genuinely demonstrates two competencies, but lead with a different part of the story. Using one story for everything suggests thin experience.
- Do I need numbers in every answer?
- No, but a result of some kind is essential. Where you have no number, say what changed and who noticed.
Know which competencies you'll be scored on
Ace reads the job description, pulls out the competencies behind it, and shows which of your experiences is the strongest evidence for each one.
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