What is a Competency-Based Interview?
A competency-based interview (also called a behavioural interview or structured interview) is a format in which every question asks you to provide a specific real-life example demonstrating a pre-defined skill or behaviour — a "competency." The interviewer is not interested in what you would do in a hypothetical situation; they want evidence of what you have already done.
Competencies are behaviours that employers have identified as predictors of success in a given role. Before the interview, the organisation maps these competencies to the job and designs questions to surface them. Your answers are then scored against a behavioural rubric, making the process more consistent and legally defensible than unstructured interviews.
How Competency-Based Interviews Differ from Other Formats
It is worth distinguishing competency-based interviews from two other common formats you will encounter, particularly at assessment centres:
| Format | Focus | Question style | Answer format | Who uses it |
|---|---|---|---|---|
| Competency-Based | Past behaviour as evidence of skills | "Tell me about a time you…" | STAR (real example) | Most large employers; Big 4, banks, civil service, grad schemes |
| Strengths-Based | What you enjoy and find energising | "Do you enjoy…?", "When do you feel at your best?" | Honest, energetic reflection | Deloitte, EY, Nestlé, Barclays |
| Case Interview | Analytical reasoning applied to a business problem | "How would you approach…?", market sizing | Structured problem-solving out loud | Management consulting (McKinsey, BCG, Bain) |
Competency-based interviews are the most widely used format at graduate level — research by the Institute of Student Employers consistently finds that over 90% of FTSE 100 employers use structured, competency-based questioning as part of their selection process. Mastering this format is the single highest-leverage interview skill you can develop.
The 10 Core Competencies Employers Assess
Although every employer defines competencies slightly differently, ten core capabilities appear repeatedly across graduate, professional, and managerial roles. Understanding what each competency really means — and preparing concrete examples for each — gives you a comprehensive evidence bank to draw from in any interview.
💬 Communication
Conveying information clearly and adapting your style to your audience, whether written or verbal. Example questions: "Tell me about a time you had to explain a complex idea to a non-expert."
🎯 Leadership
Motivating and guiding others towards a goal, even without formal authority. Example questions: "Describe a time you took charge of a situation when no one else did."
🤝 Teamwork
Collaborating effectively and supporting colleagues to achieve shared outcomes. Example questions: "Tell me about a time you had to work with a difficult team member."
🧩 Problem-Solving
Identifying root causes, generating options, and implementing effective solutions under pressure. Example questions: "Describe a complex problem you solved. What was your approach?"
📈 Commercial Awareness
Understanding how businesses operate, generate revenue, and respond to market forces. See our full commercial awareness guide. Example questions: "Tell me about a business challenge that interests you and why."
💪 Resilience
Maintaining performance under pressure, bouncing back from setbacks, and learning from failure. Example questions: "Tell me about a time you failed. What did you do next?"
🚀 Initiative & Drive
Proactively identifying opportunities and acting without being told to. Example questions: "Describe a time you went above and beyond what was expected of you."
🔄 Adaptability
Adjusting your approach when priorities shift, new information arrives, or plans change. Example questions: "Tell me about a time you had to change direction at short notice."
🔍 Attention to Detail
Producing accurate, high-quality work and catching errors before they escalate. Example questions: "Describe a time when your attention to detail prevented a significant problem."
🤝 Stakeholder Management
Identifying, engaging, and influencing the people whose support you need to achieve your goals. Example questions: "Tell me about a time you had to manage competing priorities from different stakeholders."
Most employers assess 4–6 competencies at interview. Your invitation email will usually list them. Always map your prepared examples to the specific competencies listed — do not prepare generic answers and hope for the best.
The STAR Method
The STAR method is the universally accepted framework for answering competency-based interview questions. It gives your answer a clear structure that assessors can follow and score against their rubric. See our full STAR interview technique guide for an in-depth walkthrough with more examples.
Situation — Set the scene (10% of your answer)
Briefly describe the context. Where were you, what was happening, and who was involved? Keep this concise — one or two sentences. Assessors do not need the full history; they need enough context to understand why the situation was challenging or significant.
Task — Clarify your responsibility (10% of your answer)
Explain what you personally were responsible for achieving or solving. This is where you make clear that you were not just a bystander — you had a specific role and accountability. Use "I" rather than "we" throughout.
Action — Describe what you did (60% of your answer)
This is the heart of your answer. Walk through the specific steps you took, the decisions you made, and why you made them. Be concrete: mention the tools you used, the people you involved, the obstacles you faced, and how you overcame them. Assessors are looking for evidence of the competency here — make it explicit.
Result — Quantify the outcome (20% of your answer)
State what happened as a direct result of your actions. Quantify wherever possible: "increased sales by 15%", "reduced turnaround time from 5 days to 2", "the team delivered the project two weeks ahead of schedule." If the outcome was negative, include what you learned and what you would do differently.
A common mistake is spending too long on the Situation and Task — setting up the story — and rushing the Action and Result. Assessors score your answer on what you did, not on the context. If you are running out of time, cut Situation short, never Action or Result.
The STAR-AR Variant
Some employers, particularly in investment banking and consulting, now ask a follow-up to the Result: "What would you do differently if you faced the same situation again?" This is the "Alternative Result" extension — sometimes written as STAR-AR or STAR-L (for Learning). Prepare a genuine reflection for each of your examples. Acknowledging what you would improve demonstrates self-awareness and a growth mindset, both of which are highly valued competencies in their own right.
50 Common Competency Questions by Category
Below are 50 of the most frequently asked competency interview questions, grouped by competency. Use this list to identify which questions you are most likely to face based on your target employer's framework, then prepare a strong STAR example for each category.
1. Leadership (6 questions)
- Tell me about a time you led a team through a challenge.
- Describe a situation where you had to motivate a disengaged team member.
- Give me an example of when you took initiative and led a project without being asked.
- Tell me about a time you had to make a difficult decision as a leader. How did you handle it?
- Describe a situation where you had to lead through significant uncertainty or change.
- Tell me about a time you had to give constructive feedback to someone more senior than you.
2. Teamwork & Collaboration (6 questions)
- Describe a time you worked as part of a team to achieve a challenging goal.
- Tell me about a time you had to deal with a conflict within your team.
- Give me an example of when you put the team's needs above your own.
- Tell me about a time you worked with people from very different backgrounds or skill sets.
- Describe a situation where a team project was going off track. What did you do?
- Give me an example of when you supported a colleague who was struggling.
3. Communication (5 questions)
- Tell me about a time you had to explain a complex or technical concept to a non-expert audience.
- Describe a situation where your communication skills made a significant difference to an outcome.
- Give me an example of a time you had to adapt your communication style to be more effective.
- Tell me about a time you had to persuade someone who was initially resistant to your idea.
- Describe a time when poor communication caused a problem. How did you fix it?
4. Problem-Solving & Analytical Thinking (6 questions)
- Describe a complex problem you identified and solved. What was your approach?
- Tell me about a time you had to make a decision with incomplete information.
- Give me an example of a time you used data or analysis to drive a decision.
- Describe a situation where you found a creative or unexpected solution to a problem.
- Tell me about a time you spotted an issue that others had missed.
- Give me an example of when you had to prioritise competing tasks under pressure. How did you decide?
5. Resilience & Handling Failure (5 questions)
- Tell me about a time you failed or made a significant mistake. What did you learn?
- Describe a situation where you faced a major setback. How did you recover?
- Tell me about a time you were working under significant pressure. How did you manage it?
- Give me an example of when you received critical feedback. How did you respond?
- Describe a time when you had to persist through a long or difficult project to see it through.
6. Initiative & Drive (5 questions)
- Describe a time you identified an opportunity and took action before being asked.
- Tell me about a project or goal you set for yourself entirely on your own initiative.
- Give me an example of when you went above and beyond what was expected of you.
- Tell me about a time you drove an improvement to a process or product.
- Describe a situation where you had to achieve a goal with limited resources.
7. Commercial Awareness (5 questions)
- Tell me about a current business issue or news story that interests you and why.
- Describe a time you demonstrated an understanding of how a business makes money.
- Give me an example of when you applied commercial thinking to a decision or project.
- Tell me about a time you identified a business risk or opportunity and acted on it.
- What do you think is the biggest challenge facing our industry right now?
For a deeper dive, see our commercial awareness guide.
8. Adaptability & Change (5 questions)
- Tell me about a time you had to change your approach at short notice.
- Describe a situation where you had to learn a new skill or tool quickly.
- Give me an example of when the goal or brief changed mid-project. How did you respond?
- Tell me about a time you worked in an ambiguous or rapidly changing environment.
- Describe a time you had to manage multiple competing deadlines that suddenly shifted.
Rather than preparing one example per question, prepare an "evidence bank" of 8–10 strong examples from your experience. Label each with the competencies it demonstrates. Strong examples are flexible — a single project can evidence leadership, teamwork, communication, and problem-solving depending on which aspect you emphasise. This approach means you will never be caught off-guard by an unexpected question.
Worked Example Answers (STAR Format)
The following worked examples show exactly how to structure a high-scoring STAR answer. Note the proportion of time spent on each component, the use of "I" rather than "we," and the quantified result in each case.
Tell me about a time you led a team through a challenge.
Situation: In my second year at university, I was elected President of the Economics Society two weeks before our flagship annual conference — the previous President had stepped down unexpectedly, and sponsorship deals worth £3,000 had collapsed.
Task: I was responsible for saving the event, rebuilding the sponsorship pipeline, and ensuring 150 registered attendees still had a high-quality experience, all within six weeks.
Action: I immediately called an emergency committee meeting to reassign roles and assess the damage. I personally reached out to 20 local firms using a revised sponsorship deck I rewrote to emphasise the career-development angle for their graduate recruits. I brought in two new sponsors within a fortnight, raising £2,200. In parallel, I restructured the programme to reduce costs by 30% — replacing a keynote speaker fee with a panel of alumni who donated their time. I held weekly check-ins with each subcommittee lead and introduced a shared tracking document so nothing fell through the cracks. When one speaker cancelled 48 hours before the event, I contacted a backup I had already quietly identified and confirmed them within three hours.
Result: The conference ran on time with 143 attendees — a 95% retention rate — and finished £400 under the revised budget. Post-event feedback rated the programme 4.6 out of 5. Three committee members subsequently told me it was the best-organised conference in the Society's five-year history.
Describe a situation where you had to deal with a conflict in your team.
Situation: During a summer internship at a mid-sized marketing agency, I was part of a four-person project team delivering a rebranding pitch for a retail client. Two team members — a senior designer and a junior account manager — had a growing disagreement over the visual direction, which was creating tension in our daily stand-ups and slowing progress.
Task: As the team member with the strongest relationship with both individuals, I took it upon myself to resolve the conflict before it derailed our deadline, even though this was not formally my responsibility.
Action: I spoke to each person separately and privately, asking open questions to understand their concerns without taking sides. I found that the designer felt his expertise was not being respected, while the account manager had received direct client feedback she felt obliged to relay but had communicated clumsily. I then facilitated a 30-minute structured conversation between them, starting by asking each to state what outcome they wanted for the client — not for themselves. Once we established shared ground on the client goal, I proposed a decision framework: client feedback would define the brief, and within that brief, design execution would be the designer's call. Both agreed. I also suggested a weekly "creative check-in" to surface issues earlier.
Result: The tension dissipated within two days. We submitted the pitch on time and won the client contract — a deal valued at approximately £80,000. The account manager later told me the structured conversation was the most useful conflict-resolution experience of her career to date.
Tell me about a time you failed or made a mistake. What did you learn?
Situation: In my first part-time role as a research assistant, I was responsible for compiling a weekly data report for a research team of eight. Three weeks into the role, I sent out a report containing an error in the summary statistics — I had pulled data from the wrong date range — and the team lead used it to make a recommendation to a senior stakeholder before the error was caught.
Task: I had to acknowledge my mistake, correct the error, manage the immediate fallout with the team lead and stakeholder, and put something in place to ensure it never happened again.
Action: As soon as the error was identified — by me, the following morning — I went directly to my line manager before anyone else and explained exactly what had happened and why. I did not minimise it or wait to be called out. I prepared a corrected report within two hours and offered to brief the stakeholder directly with the updated figures. My manager handled the stakeholder communication herself but appreciated that I had come forward immediately. I then designed a two-step verification checklist for myself: I would cross-reference the date parameters against the brief before compiling, and do a sense-check comparison against the previous week's totals before sending. I shared this checklist with the team in case it was useful for others.
Result: There were no further data errors in the six months I remained in the role. My manager referenced my response to the mistake positively in my end-of-placement review, noting that my transparency and the corrective process I put in place demonstrated a level of professionalism she had not expected from a first-year student.
Employer-Specific Competency Frameworks
While the core competencies are largely universal, every major employer brands them differently and weights them according to their culture and strategy. The table below maps the most common frameworks you will encounter so you can tailor your preparation accordingly. The underlying skills are the same — only the labels and emphasis differ.
| Employer | Framework & Key Competencies | Our Guide |
|---|---|---|
| PwC | Professional competencies: commercial awareness, leadership, teamwork, communication, problem-solving. Questions tied to their "PwC Professional" framework across five dimensions. | PwC Assessment Centre Guide |
| Deloitte | Professional competencies: collaboration, curiosity, client impact, influence. Note: Deloitte uses a strengths-based element alongside competency questions. | Deloitte Aptitude Test Guide |
| EY | Professional competencies: teamwork, commercial awareness, leadership, communication, problem-solving. EY uses a mix of strengths-based and competency-based questions. | EY Aptitude Test Guide |
| KPMG | Professional competencies: commercial awareness, leadership, resilience, teamwork, communication, adaptability. | KPMG Aptitude Test Guide |
| Goldman Sachs & JP Morgan | Client focus, intellectual rigour, resilience, teamwork, initiative. Investment banks typically run highly structured competency interviews with multiple rounds. | Goldman Sachs · JP Morgan |
| Barclays | Client focus, integrity, resilience, commercial awareness, teamwork and collaboration. | Barclays Aptitude Test Guide |
| McKinsey & Accenture | Analytical thinking, structured communication, entrepreneurship, personal impact. McKinsey uses the PEI (Personal Experience Interview) alongside case interviews. | McKinsey Interview Guide · Accenture Guide |
| Civil Service Fast Stream | Civil Service Behaviours framework: Making Effective Decisions, Communicating & Influencing, Delivering at Pace, Working Together, Leadership, Managing a Quality Service, Seeing the Big Picture, Developing Self & Others. | Civil Service Fast Stream Guide |
| Amazon | 14 Leadership Principles (Customer Obsession, Ownership, Invent & Simplify, Are Right A Lot, Learn & Be Curious, Hire & Develop the Best, Insist on the Highest Standards, Think Big, Bias for Action, Frugality, Earn Trust, Dive Deep, Have Backbone, Deliver Results). Every competency question maps explicitly to a Leadership Principle. | Amazon Aptitude Test Guide |
Before your interview, download the employer's competency framework from their careers page. Most employers publish it explicitly — search for "[employer name] competency framework" or "[employer name] values and behaviours." Map each competency to your best examples before the interview, not during it.
Common Mistakes to Avoid
Even well-prepared candidates lose marks through avoidable mistakes. These are the six most common errors assessors report seeing, along with how to fix each one. For detailed structuring advice, see our STAR interview technique guide.
- Telling a story without a clear Result. Quantify your results wherever possible — numbers, percentages, timeframes, or qualitative outcomes (e.g. "client renewed the contract", "team morale visibly improved"). Vague endings like "it went well" score near zero on most rubrics.
- Using "we" instead of "I." Assessors need to understand your individual contribution, not what the team achieved collectively. Replace "we decided" with "I proposed and the team agreed." You can credit others in your Result, but your Action must be personal.
- Choosing a weak or irrelevant example. Pick examples from the last three years that are genuinely impressive — a leadership moment from a 12-person project beats "I once helped a friend." If your best example is from secondary school, acknowledge that and focus on the quality of your analysis and learning.
- Preparing only for expected questions. Most competencies can appear in multiple question forms. Prepare flexible examples — ones that you can angle towards leadership, teamwork, or resilience depending on what is asked — rather than memorising one answer per question.
- Failing to structure the answer (rambling). Without the STAR structure, answers drift and assessors cannot find the evidence they are looking for. Practice out loud with a two-minute timer. If you cannot deliver a complete STAR answer in under three minutes, keep practising.
- Not linking the answer back to the role or employer. Briefly close each answer by connecting the competency you demonstrated to why it matters for this specific role. "That experience taught me how to manage senior stakeholders under pressure, which I know is central to the analyst role here." One or two sentences is enough — it signals genuine engagement with the position.
Frequently Asked Questions
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