Competency-Based Interviewing: A Step-by-Step Guide

Competency-based interviewing (CBI) is the foundation of structured hiring. Instead of asking candidates about themselves in the abstract, you test for specific, observable behaviours that the role requires. This guide explains how to implement it from end to end.

What Is a Competency?

A competency is a cluster of behaviours that predicts performance in a specific role. It's not a personality trait ("is confident") or a qualification ("has a degree"). It's something observable in how a person acts: how they handle conflict, how they prioritise under pressure, how they develop people.

Step 1: Identify the Role's Critical Competencies

Start with the job description, but don't stop there. The most important step is talking to people who know the role well. Ask: "What does someone have to be exceptionally good at to succeed here — not just survive?" Typical frameworks include:

• Technical competencies — specific to the role (e.g. P&L management, route planning, food safety)
• Leadership competencies — managing, coaching, motivating others
• Behavioural competencies — applicable across roles (resilience, communication, commercial thinking)

For most operational roles, 4–6 competencies is the right scope. More than that, and you can't assess any of them with real depth.

Step 2: Write Behavioural Indicators

For each competency, write 3–5 behavioural indicators — specific things you'd expect to see someone doing if they're strong in that area. For "Developing Others," indicators might be:

• Regularly has structured 1:1s with direct reports
• Can cite specific examples of people they've coached to promotion
• Adapts communication style to the individual's learning needs

Step 3: Write Questions That Reveal Evidence

Each question should be specifically designed to surface evidence of the behavioural indicators above. The best questions are open-ended, past-focused, and specific. For "Developing Others": "Tell me about someone in your team who really grew under your management. What did you do specifically to support their development?"

Step 4: Create Scoring Criteria

Behavioural anchors describe the standard of answer expected at each score point. They convert subjective impressions into something comparable across candidates. A well-written set of anchors makes scoring faster, not slower — because you're matching against a description, not forming a fresh judgement each time.

Step 5: Train Your Interviewers

Even the best scorecard fails if interviewers don't use it consistently. A 30-minute calibration session before the start of an interview round is enough to align scoring standards and reduce inter-rater variance.

CBI in High-Volume Hiring

In retail, hospitality, and logistics, you're often running CBI with dozens of candidates for similar roles. The key is standardisation: the same competencies, the same questions, the same scoring rubric across all interviewers and all locations. Done well, this turns subjective hiring into something scalable and defensible.