Competency-Based Interviews: How to Master the STAR Technique

Many employers use competency-based interviews to understand how you have behaved in real workplace situations. The principle is simple: Past behaviour is often the best predictor of future performance. Rather than asking hypothetical questions such as "What would you do if...?", interviewers will ask questions beginning with:

• Tell me about a time when...
• Give me an example of...
• Describe a situation where...
• Can you talk me through a time you...

These questions are designed to assess key competencies such as:

• Leadership
• Communication
• Teamwork
• Problem solving
• Influencing
• Customer focus
• Decision making
• Resilience
• Managing conflict
• Stakeholder management
• Time management

The easiest and most effective way to answer these questions is by using the STAR technique.

What Does STAR Stand For?

S – Situation

Briefly explain the background.

Set the scene so the interviewer understands the context.

T – Task

Explain what your responsibility or objective was.

What problem needed solving?

What outcome were you aiming for?

A – Action

This is the most important part of your answer.

Explain exactly what you did.

Not what the team did.

Not what your manager did.

What you personally contributed.

R – Result

Finish with the outcome.

Whenever possible, include measurable results and explain what you learned.

Why Interviewers Like STAR

Interviewers often score candidates against a competency framework. Using STAR allows you to:

• Answer questions in a clear, logical order.
• Stay focused without rambling.
• Demonstrate your personal contribution.
• Show your decision-making process.
• Highlight achievements with evidence.

It also makes it much easier for the interviewer to award you marks against each competency.

Breaking Down Each Stage:

Situation

Keep this brief—around 15–20% of your answer.

Simply provide enough information for the interviewer to understand the scenario.

Include:

• Where you were working
• The project or situation
• The challenge
• Why it mattered

Avoid spending several minutes explaining background information.

Task

Explain what was expected of you.

This should answer questions such as:

• What was your responsibility?
• What problem needed solving?
• What outcome were you trying to achieve?

Remember, the interviewer wants to know your role, not the wider company's objectives.

Action

This is where most of your answer should focus (around 60%).

Interviewers are trying to understand:

• How you think
• How you make decisions
• How you influence others
• How you solve problems
• How you communicate

Always speak in the first person:

✅ "I analysed..."

✅ "I decided..."

✅ "I worked with..."

Rather than:

❌ "We did..."

Even if the work was completed by a team, make sure your individual contribution is clear.

A strong Action section explains:

• What you did
• Why you chose that approach
• How you communicated
• Challenges you overcame
• Decisions you made
• How you influenced others
• Any tools, processes or methodologies you used (where relevant)

Don't assume the interviewer knows your industry or your business. Explain your thinking clearly.

Result

Always finish your story.

Too many candidates forget this.

Tell the interviewer:

• What happened?
• Did you achieve your objective?
• What was the impact?
• What did the customer or stakeholder think?
• What did you learn?

Whenever possible, quantify your results.

For example:

• Increased customer satisfaction by 18%.
• Reduced project delivery time by four weeks.
• Saved £250,000 annually.
• Retained a strategic client worth £3 million.
• Improved processing accuracy from 92% to 99%.

Even if the outcome wasn't perfect, explain what you learned and how you would approach it differently next time. Interviewers value self-awareness and continuous improvement.

Top Tips for STAR Interviews:

Keep your answers concise

Aim for around 2–3 minutes per example.

Prepare examples in advance

Think about examples covering:

• Leadership
• Managing conflict
• Delivering under pressure
• Influencing stakeholders
• Solving problems
• Handling difficult customers
• Delivering change
• Working as part of a team
• Failing and what you learned
• Achieving success

Often, one strong example can be adapted for several different competency questions.

Make it about you:

The interviewer is assessing your capability, not your team's. If your answer contains the word "we" more than "I", you're probably missing opportunities to showcase your own contribution.

Quantify your impact:

Numbers are memorable. Whenever possible include:

• Revenue
• Cost savings
• Customer numbers
• Timescales
• Percentages
• Team sizes
• Project values

Finish positively: 

End every answer by reinforcing the value you delivered and the lessons you learned.

Example STAR Answer:

Question:

"Tell me about a time you dealt with a difficult customer."

Situation

Whilst working for ABC Payments, we experienced an unexpected platform outage that caused payment processing delays for several merchants. One of our largest customers contacted me extremely frustrated, as the disruption was affecting their business operations and confidence in our service.

Task

My responsibility was to rebuild the customer's confidence, provide clear and honest communication, manage expectations, and work internally with technical teams to ensure they received accurate updates until the issue was resolved.

Action

I contacted the customer immediately rather than waiting for them to chase us. I acknowledged the impact the outage was having on their business, apologised sincerely, and listened carefully to their concerns without interrupting. I then worked closely with our technical support and engineering teams to understand the root cause, obtain realistic recovery times, and ensure I had accurate information before updating the customer. Rather than providing generic responses, I agreed a communication plan with regular progress updates so they always knew what was happening. Throughout the incident I remained calm, transparent and empathetic, ensuring they felt informed and supported.

Result

The customer remained with the business and thanked us for the honesty and level of communication throughout the incident. The experience reinforced the importance of proactive communication, empathy and managing expectations during difficult situations. It also strengthened my relationships internally, as I worked collaboratively across multiple teams to deliver the best possible outcome for the customer.

Final Advice

Remember that competency interviews are not looking for the "perfect" story—they're looking for evidence of how you think, behave and deliver results.

If you can clearly explain the Situation, your Task, the Actions you personally took, and the Results you achieved, you'll give yourself the best possible chance of standing out from other candidates.

Preparation is key. Spend time before your interview identifying five or six strong STAR examples from your career that demonstrate your skills and achievements. With a little practice, you'll find you can adapt these examples to answer a wide range of competency-based interview questions confidently and naturally.