How to Run a Structured Interview: A Practical Guide for Founders
Unstructured interviews feel natural but produce poor hiring decisions. Structured interviews are more predictive, more defensible, and easier to run consistently. Here is how to build one.
Most hiring interviews are conversations that feel productive but predict almost nothing. Research consistently shows that unstructured interviews have low validity as a hiring tool. Structured interviews, with consistent questions and a defined scoring rubric, are significantly more accurate and protect you legally. Here is how to run one.
Why unstructured interviews fail
An unstructured interview is a free-form conversation where each candidate is asked different questions based on where the discussion goes. It feels natural because it mirrors how people talk. But it is deeply flawed as an assessment tool.
The core problem is inconsistency. When you ask different questions to different candidates, you cannot make an apples-to-apples comparison. You end up making decisions based on charisma, comfort, and similarity bias rather than actual relevant competence. The candidate who reminded you of a successful colleague, or who happened to mention a shared interest, gets the halo effect. The one who was nervous but highly competent gets passed over.
Unstructured interviews also create legal risk. A hiring process that appears inconsistent is harder to defend against a discrimination claim. If you asked one candidate about their experience with compliance and another candidate about their career goals, you have no documented basis for comparing them on relevant criteria.
What a structured interview is
A structured interview has four components: a defined set of questions asked consistently to every candidate for the same role, a clear scoring rubric for each question, a structured debrief process for the hiring team, and documentation of the evaluation.
The questions are determined before any interviews begin, based on the specific competencies required for the role. Every candidate gets the same questions in the same order. The interviewers score each answer independently before the group debrief. The scoring is documented.
This does not mean the interview is robotic. You can probe and follow up within each question. The discipline is in asking the same core questions and scoring the answers against the same criteria.
The four types of questions that work
The most predictive interview questions fall into four categories. A well-designed structured interview uses all four in proportion to what the role actually requires.
- Behavioral questions: Ask candidates to describe specific past situations. 'Tell me about a time you had to make a difficult decision with incomplete information.' Past behavior is the best available predictor of future behavior. Listen for specificity: vague answers about what they 'generally do' are a red flag. Good answers have a concrete situation, a clear action the candidate took personally, and a measurable result.
- Situational questions: Present a hypothetical scenario relevant to the role. 'If you discovered a significant compliance gap in our HR documentation on your first week, how would you approach it?' These reveal judgment and problem-solving approach. They are particularly useful for roles where the candidate may not have direct experience in your specific context.
- Role-specific knowledge questions: Test specific technical or domain knowledge required for the role. 'Walk me through how you would structure a compensation benchmarking exercise for a 30-person company.' These should be graded against a clear expected answer, not vibes.
- Culture and values questions: Assess alignment with how your company operates. 'Tell me about an environment where you did your best work, and one where you struggled.' These surface working style preferences and values. Grade against the actual culture of your company, not an idealized version of it.
Questions you cannot legally ask
Federal and state law prohibits using certain information in hiring decisions. Questions that elicit this information, directly or indirectly, create legal exposure even if the intent was innocent.
Do not ask about age, date of birth, or year of graduation. Do not ask about national origin, citizenship, or where someone was born. Do not ask about marital status, family plans, or whether a candidate has children. Do not ask about religion or religious practices. Do not ask about disability, medical conditions, or medications. Do not ask about past workers' compensation claims.
The practical rule: if the question is not directly relevant to the ability to perform the essential functions of the job, do not ask it. If you have a legitimate operational need (for example, the role requires weekend availability), ask about availability specifically, not about family obligations.
Building your scoring rubric
A scoring rubric converts subjective impressions into comparable data. For each question, define what a strong answer, an acceptable answer, and a weak answer look like before you start interviewing.
A simple three-point scale works for most small companies: 1 is below expectations for the role, 2 meets expectations, 3 exceeds expectations. Interviewers score independently before the debrief. This prevents anchoring, where the first person to speak shapes everyone else's evaluation.
After all interviews for a candidate are complete, hold a structured debrief. Each interviewer shares their scores and the specific evidence behind them before any discussion. This prevents the highest-status person in the room from driving consensus by instinct rather than evidence.
The debrief and the decision
The debrief is where structured interviews most often break down. Hiring teams collect structured data and then have an unstructured conversation that ignores it. The scores matter. If a candidate scores 1 on a core competency, that should require a very specific reason to override.
Aggregate each candidate's scores across all interviewers and all competencies. Compare candidates on the same dimensions. Make the decision based on the evidence, not on who felt best to talk to.
Document the decision. A brief written record of the scores, the key discussion points, and the rationale for the final decision is your protection if the process is ever challenged. Store it with the candidate's file.