How to Prepare for a Competency-Based Interview

A competency-based interview rewards preparation done in advance far more than quick thinking in the room. The people who do well aren't necessarily better at answering on the spot, they've usually done the groundwork days or weeks before the interview so the actual conversation feels like retrieval, not invention.

Find the employer's actual framework

Many large employers, particularly graduate schemes, civil service and public sector roles, and big consultancies, publish the specific competencies they assess: things like "resilience", "commercial awareness", or "collaborative working". Search the employer's careers page and any assessment centre guidance they've shared. When you can name the exact competency an interviewer is testing rather than guessing at a generic version, your examples land as deliberately chosen rather than repurposed from a different application.

Build a story bank, not a set of answers

Preparing answer by answer for every possible question is inefficient and doesn't hold up under follow-up questions. Instead, pull together six to eight strong examples from your experience covering the situations competency interviews return to again and again: a time you led something, resolved a conflict, failed at something and recovered, worked in a difficult team, and solved a problem with limited information. Each story can usually flex to answer several different questions depending on which part of it you emphasise.

Structure each story before you need it

Put every story into the STAR format, situation, task, action, result, ahead of time, not while you're answering. Trying to structure a story in real time while also thinking about content is where most people stumble, even when they have a strong example. If the structure is already set, the interview becomes a matter of recalling it under mild pressure rather than building one from scratch.

Practise saying it, not just thinking it

A story that works when you think it through silently often comes out clumsier the first time you say it out loud. Rehearse your stories verbally, ideally to another person or recorded so you can hear yourself, at least once before the interview. This is where timing, filler words, and unclear transitions show up, and they're far easier to fix in a practice run than in the actual interview.

Prepare questions that show you understand the framework

Competency-based interviews are usually run by organisations with a formal approach to development and progression. Ask about how they develop the specific competencies they assess candidates on, how feedback is given after the interview, or how the competency framework connects to promotion criteria. It signals that you understood the format of the interview, not just the content of your own answers.