Competency-based interviews are structured so that every candidate answers the same questions and is scored against the same criteria. The interviewer's job isn't to have a conversation: it's to gather specific behavioural evidence for a predefined list of competencies. Understanding this changes how you should prepare.
What is a competency-based interview?
A competency-based interview (also called a structured or behavioral interview) asks every candidate the same fixed set of questions, each targeting a specific competency such as communication, leadership, or problem-solving, and scores every answer against the same predefined criteria. The premise is that past behaviour predicts future behaviour: every question asks you for a real example of something you actually did, and the interviewer uses that example to infer how you're likely to behave in the role.
This differs from traditional interviews (where you can speak hypothetically: "I would do X") and from technical interviews (where you solve problems live). In competency-based interviews, every answer must be grounded in something that actually happened.
Common in: government and public sector roles, large corporate graduate schemes, financial services, consulting, and any organisation with a structured approach to talent management.
The STAR method
STAR is the standard framework for competency answers:
- Situation: Brief context: what was happening, what was the challenge?
- Task: What was your specific responsibility in this situation?
- Action: What did YOU do? (not "we": your specific actions and decisions)
- Result: What happened? Quantified if possible. What did you learn?
Most answers should run two to three minutes. The Action section should be the longest: this is where the assessor gathers evidence of your competence. Don't spend the first minute setting up context and run out of time on the substance.
Most common competencies and questions
Communication
"Tell me about a time you had to explain something complex to someone who didn't have the same background as you."
"Describe a situation where you had to adapt your communication style to get your message across."
What a strong answer shows: you identified the gap in the other person's knowledge before speaking, deliberately chose language and examples suited to them (not a generic explanation), and checked they had actually understood rather than assuming it. A weak answer just describes what was explained, with no evidence you adapted your approach to the audience.
Leadership
"Give me an example of when you motivated a team to achieve a goal."
"Tell me about a time you led through a period of change or uncertainty."
What a strong answer shows: a specific action you took to align or motivate people, not just your job title. Even without formal authority, strong answers describe influencing outcomes, setting direction, or supporting others through ambiguity. Quantify the result: team output, retention, or a delivery date that would otherwise have slipped.
Problem-solving and analysis
"Describe a complex problem you had to work through. How did you approach it?"
"Tell me about a time you used data or analysis to inform a decision."
What a strong answer shows: a clear method, how you broke the problem down, what information you gathered, what options you weighed, rather than just landing on the answer. Assessors are scoring your process as much as your outcome.
Teamwork and collaboration
"Tell me about a time you worked effectively as part of a team."
"Give an example of when you had a disagreement with a colleague and how you resolved it."
What a strong answer shows: your specific contribution to a shared outcome, and, for conflict examples, that you resolved the disagreement professionally and preserved the working relationship rather than "winning" the argument.
Influencing and stakeholder management
"Tell me about a time you persuaded someone to change their mind or adopt a different approach."
"Describe a situation where you managed a difficult or resistant stakeholder."
What a strong answer shows: you understood the other person's perspective and objections before trying to influence them, used evidence or a framing that mattered to them specifically, and reached a genuine change in position, not just compliance.
Resilience and handling pressure
"Describe a time you had to deal with significant pressure or a setback. How did you handle it?"
"Tell me about a time you received critical feedback. What did you do with it?"
What a strong answer shows: you stayed functional and made good decisions under the pressure, rather than just describing that the situation was stressful. For feedback questions, show you acted on it afterward, not just that you accepted it gracefully in the moment.
Commercial awareness
"Give me an example of when you made a decision that had a direct commercial impact."
"Tell me about a time you identified a business opportunity or risk."
What a strong answer shows: you understood the business, not just the task, and connected your action to a measurable commercial outcome: cost saved, revenue protected, or risk avoided, with a number attached wherever possible.
Handling follow-up probes
Trained assessors will probe your answers. This is normal and expected: it's how they gather more evidence, not a signal that your answer was wrong.
Common probes:
- "What specifically did you do?" (If your answer was too "we"-focused)
- "What was the outcome?" (If you didn't give a result)
- "How did you feel in that situation?" (Probing emotional intelligence)
- "What would you do differently?" (Probing self-awareness and learning)
Answer probes directly and concisely. Don't restart your whole answer: just answer the specific question being asked.