Structured interview: the STAR method with measurable scores

What is a structured interview?

A structured interview is a job interview in which every candidate gets the same questions, in the same order, scored on the same criteria. The goal is not to have a good conversation, but to measure behavior that is relevant to the job.

The difference from an unstructured conversation is fundamental. In an unstructured conversation, the interviewer decides on the spot which questions to ask. That leads to confirmation bias, halo effects and conversations that cannot be compared. In a structured interview, the questions, the scoring criteria and the behavioral anchors are fixed in advance. The meta-analysis by Schmidt & Hunter shows that structured interviews have a predictive validity of .51, compared with .38 for unstructured conversations.

That does not make the conversation mechanical. The main question is fixed, but the interviewer can probe further to get depth. The difference is that the assessment is standardized, not the conversation itself.

The STAR method: structure in question and answer

The STAR method is the most widely used framework for behavioral interview questions. STAR stands for Situation, Task, Action and Result.

• Situation: the context in which the behavior took place. "Describe a situation in which you had to deal with a conflict in your team."
• Task: what was the candidate responsible for? What was expected?
• Action: what did the candidate actually do? This is the core of the answer.
• Result: what was the effect of the action? What changed?

The strength of STAR is that it forces the candidate to describe concrete behavior instead of giving hypothetical answers. "What would you do if..." yields less predictive information than "What did you do when...".

Besides STAR questions (behavioral, about the past) there are situational questions, such as "Imagine that...". These are valuable as a supplement, but behavioral questions have a higher predictive validity.

BARS scoring: from impression to measurement

Behaviorally Anchored Rating Scales (BARS) translate a subjective impression into an objective score. For each behavioral indicator there are concrete descriptions of what a score of 1, 3 or 5 means.

• Score 1 (weak): the candidate describes no concrete behavior, or the behavior is not effective in the context of the competency.
• Score 3 (average): the candidate describes relevant behavior with a reasonable result, but lacks depth or ownership.
• Score 5 (strong): the candidate describes concrete, self-owned behavior with a clearly positive result that ties in directly with the competency.

The anchors are specific to each behavioral indicator. "Collaboration" has different anchors than "Results orientation". That makes the scoring precise and reproducible.

The advantage of BARS over a simple 1-5 scale is that two interviewers scoring the same candidate end up closer together. The anchors reduce subjectivity.

From job profile to interview questions

The interview questions are derived from the job profile. The path is job, competencies, behavioral indicators, interview questions.

Every competency in the job profile has behavioral indicators, which are concrete descriptions of observable behavior. For each behavioral indicator, a STAR question is formulated that elicits that specific behavior.

• Example: the competency "Collaboration" has the behavioral indicator "Actively seeks input from team members on decisions". The interview question becomes: "Describe a situation in which you had to make an important decision that affected your team. How did you involve your team members?"

The follow-up questions are also defined in advance, such as "Who did you involve?", "How did they respond?" and "What would you do differently?". This helps the interviewer get depth without steering.

This process can be done manually, but it can also be automated. If the behavioral indicators are in the job architecture, the interview questions can be generated. The recruiter reviews and adjusts them, but the starting point is there.

Comparability with 360-degree feedback and assessments

Structured interviewing becomes more powerful when the scores are comparable with other measurement instruments. That is possible when they speak the same language, meaning the same competencies and behavioral indicators.

A 360-degree feedback round measures how colleagues experience someone's behavior on the same behavioral indicators. An assessment measures aptitude and personality on the same competencies. The interview measures how the candidate describes their own behavior.

Three sources, one yardstick. For each competency you can see how the candidate scores in the interview, in the assessment and (for internal candidates) in the 360-degree feedback. That gives a more complete picture than any source on its own.

This is not theory. It works when the data model supports it. If interview scores, assessment results and feedback scores are all linked to the same behavioral indicators, they are directly comparable in a talent matching profile.

Panel interviews and independent scoring

In a panel interview, several interviewers score the same candidate independently of each other. Each interviewer gives their own score per behavioral indicator, without seeing the scores of the others.

This increases reliability. If two interviewers independently arrive at the same score, that score is more reliable than a single assessment. If they differ widely, that is a signal to explore the conversation further.

The unique constraint is one score per behavioral indicator per interview per scorer. This means every panel member records their own, independent judgment. The comparison happens afterwards.

Practical tips for the interviewer

• Prepare: read through the questions and anchors before the interview. Know which competencies you are measuring and what a strong answer looks like.
• Listen for behavior, not intention: "I would..." is less valuable than "I did...". Probe for concrete behavior.
• Score right after the interview: the longer you wait, the more your memory distorts. Score per question, not as an overall impression.
• Write down observations: write down what the candidate said, not what you thought of it. The notes support the score.
• Discuss only after independent scoring: in a panel interview, you discuss the scores only after everyone has scored independently. That prevents groupthink.