How to prepare for a competency-based interview

Understand what the question is testing

Questions such as “Tell me about a time you influenced a difficult stakeholder” are asking for observable evidence. The interviewer is listening for the context, the choices you made, how you acted and what happened. The surface topic is the story; the competency is the reason the story is being requested.

Read the job description and group repeated language into likely competencies: judgement, collaboration, delivery, leadership, customer focus, analysis or resilience. Do not prepare equally for every competency in the world. Prepare for the ones this role is likely to score.

Build an evidence bank before writing answers

List projects, difficult decisions, failures, improvements, conflicts and moments of responsibility from your real experience. Then map each example to the competencies it could demonstrate. One strong example may support several questions, but it should not be forced into every answer.

Include examples from work, study, volunteering or substantial personal projects when they provide the clearest evidence available. The standard should match your career stage. An early-career candidate is not expected to have executive scope; they are expected to explain their own contribution honestly.

• What was at stake?
• What was specifically yours to decide or deliver?
• What action did you take, and why?
• What changed, and what did you learn?

Use structure without sounding scripted

STAR—Situation, Task, Action, Result—is useful because it stops an answer becoming a long scene-setting exercise. Keep the situation and task brief. Spend most of the answer on your action, reasoning and the result.

Reflection can strengthen the answer when it is real: what you would repeat, what you would change or what the experience taught you. Preparation should make the route through the story familiar while leaving the language natural.

Structure is there to make your evidence easier to follow, not to make every answer sound identical.

Prepare for probing questions

Interviewers may ask what you personally did, why you chose that approach, what alternatives you considered or how you know the result was successful. A memorised answer often collapses here. A real example becomes clearer.

Practise explaining the example at two lengths: a concise version and a fuller version. Record yourself once. Listen for missing actions, excessive background, unexplained jargon and places where “we” hides your own contribution.

Prepare the whole room, not only the questions

Review the organisation, the role and the likely concerns behind the hire. Prepare questions that help you understand the work, success measures and constraints. Also prepare a short introduction that connects your experience to this role without retelling your full CV.

On the day, listen to the exact question. Use the nearest truthful example, not the story you were most determined to tell. If an example is imperfect, say what you learned. Trust is built by clarity and judgement, not by pretending every situation ended perfectly.