A competency-based interview (CBI) operationalises the competency framework in the recruiting process. Where the competency framework defines what 'good' looks like across role dimensions, the CBI creates the structured conversation that generates evidence of whether a candidate demonstrates those behaviours. It bridges the gap between a theoretical capability model and an empirical hiring decision.
CBI questions are behavioural by design: they ask candidates to describe specific past situations that demonstrate the relevant competency. The STAR structure (Situation, Task, Action, Result) provides a framework for both eliciting complete answers and evaluating them. A complete STAR answer describes the context (Situation), the specific responsibility (Task), the actions the candidate took (Action), and the outcomes of those actions (Result). Incomplete answers — those that describe what the candidate would generally do rather than what they specifically did — are less reliable as evidence of actual capability.
The choice of competencies assessed in the CBI is driven by the role's competency profile. For a leadership role, the CBI might assess: developing others, strategic thinking, managing through ambiguity, and stakeholder influence. For a customer-facing role: communication, resilience, problem-solving, and customer focus. Each competency is assessed by two to three questions with scoring anchors that define strong, moderate, and weak behavioural evidence for that competency.
Key Points: Competency-Based Interview
- Competency-framework anchored: Questions are derived directly from the competency framework, ensuring evaluation criteria are consistent with the organisation's capability model.
- STAR methodology: Situation-Task-Action-Result structure provides a consistent framework for both eliciting and evaluating competency evidence.
- Past behaviour focus: CBI assumes past behaviour predicts future behaviour — candidates who have demonstrated competencies in previous roles are more likely to demonstrate them again.
- Scoring consistency: Behavioural anchors ensure different interviewers apply consistent standards when evaluating the same competency.
- Follow-up probing: Interviewers should probe incomplete answers — asking for more detail on the action the candidate took or the outcome they achieved.
How Competency-Based Interview Works in Treegarden
Competency-Based Interview in Treegarden
Treegarden's scorecard builder supports competency-based interview design. For each job, recruiters or HR configure the relevant competencies from the organisation's framework, add the specific CBI questions for each competency, and attach the scoring anchors. Interviewers access the scorecard during or immediately after the interview, rate each competency, and add qualitative notes. The structured format ensures consistent evaluation regardless of which team member conducts the interview.
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Related HR Glossary Terms
Frequently Asked Questions About Competency-Based Interview
STAR stands for Situation, Task, Action, Result — a four-part structure for answering behavioural interview questions and for evaluating the completeness of answers. Situation: the candidate describes the context and circumstances of the example they are giving (when, where, with whom, what was happening). Task: the candidate describes their specific responsibility or the challenge they faced in that situation. Action: the candidate describes specifically what they did — the steps they took, the decisions they made, the approach they used. This is the most important part from an evaluation standpoint, as it reveals the candidate's actual behaviour. Result: the candidate describes the outcome of their actions, ideally with specific quantified evidence (the project was delivered two weeks ahead of schedule, customer satisfaction improved by 15%). The STAR structure helps interviewers evaluate whether the candidate is providing genuine behavioural evidence or speaking in generalities about what they 'typically do.
Competency-based interviews assess behavioural capabilities — how a candidate approaches challenges, builds relationships, makes decisions, and handles adversity — through structured questions about past situations. Technical interviews assess domain knowledge and specific skills through exercises, problems, or questions that require technical expertise to answer correctly. Most hiring processes for technical roles combine both: a competency-based component assesses the behavioural fit and soft-skill competencies that predict how the person will perform in the team and role context, while a technical component assesses whether they have the specific skills and knowledge required to do the work. Neither type alone produces a complete picture for most professional roles — both dimensions of fit matter.
Yes, and this is a feature of the format rather than a problem. Competency-based interviews assess real past experience — no amount of preparation can fabricate genuine accomplishments if the candidate doesn't have them. Candidates who prepare by identifying the two or three most relevant examples from their work history for each likely competency area, and structuring those examples in STAR format, will provide more complete and articulate answers. This preparation makes the interviewer's job easier (more structured answers are easier to score against the criteria) and produces more reliable data (prepared candidates are less likely to forget relevant examples under interview pressure). Informing candidates in advance about the format — 'our interview will use a competency-based format; you will be asked about specific past experiences' — produces better assessment data and a better candidate experience.
A single competency-based interview session can realistically assess three to five competencies with two questions each in a 45-60 minute interview. Attempting to assess more competencies in a single session requires either shorter time on each competency (reducing the quality of the evidence gathered) or extending the interview beyond the point where candidates can sustain the same quality of reflection (typically 60-90 minutes maximum). In multi-round interview processes, competencies are distributed across rounds — the hiring manager interview assesses one set, a peer panel interview assesses another. The total number of competencies assessed across all rounds depends on the role's complexity and the number of critical competency areas identified in the job analysis, typically totalling eight to twelve for professional and senior roles.