A structured interview asks every candidate the same job-related questions in the same order and scores each answer against a predefined rating scale, while an unstructured interview is a free-flowing conversation in which the questions change from candidate to candidate and the interviewer forms an overall impression. Research on hiring has generally found that structured interviews predict job performance better, which is why many employers, including the US federal government, recommend them.
Most real interviews sit somewhere between the two. This guide explains what each style looks like, how you are scored, what the evidence says and how to prepare for both. For every other format, see our overview of the types of job interviews.
What is the difference between a structured and unstructured interview?
The US Office of Personnel Management (OPM) describes structured interviews as ones that use rules for eliciting, observing and evaluating responses, so that different interviewers reach more similar conclusions (OPM structured interview guidance). An unstructured interview has few or no such rules. Here is how that plays out.
| Structured interview | Unstructured interview | |
|---|---|---|
| Questions | Written in advance from a job analysis; the same for everyone | Chosen by the interviewer, often in the moment |
| Order | Fixed | Follows the conversation |
| Follow-ups | Set probes, such as "What was your specific role?" | Anything the interviewer finds interesting |
| Scoring | Each answer rated on a scale with example answers at each level | An overall impression, often discussed afterward |
| Note-taking | Detailed, often close to verbatim | Light or none |
| How it feels | Formal, a little scripted, less small talk | Conversational and relaxed |
| Common question types | Behavioral ("Tell me about a time…") and situational ("What would you do if…") | "Tell me about yourself," "Walk me through your résumé," open discussion |
| Where you often see it | Government roles, large employers, competency-based processes | Small companies, informal chats, some founder or executive interviews |
How does scoring work in each type of interview?
Structured: a rating scale per question
In a structured interview, each question usually has its own rating scale with example answers that describe each level. OPM notes that highly structured interviews are scored against benchmarks of proficiency, and that they are usually scored by a panel in which each member rates your answers individually before the group discusses large differences. Here is an example scale we wrote for the question "Tell me about a time you had to meet a tight deadline":
| Rating | What the answer contains |
|---|---|
| 1: Weak | A general statement ("I always work hard under pressure") with no specific example |
| 3: Acceptable | A specific situation and the actions taken, but the candidate's own role is blurred with the team's, and the result is vague |
| 5: Strong | A specific situation, the candidate's own decisions on what to cut or delegate, how they flagged risk early, a measurable result and what they would repeat |
The practical point: the interviewer scores only what you say. If you leave out your result, they usually cannot give you credit for it, and in a strict structured interview they may not be allowed to prompt you for it.
Unstructured: an overall judgment
In an unstructured interview, the interviewer typically leaves with a general view, such as "strong communicator, not sure about depth," and shares it in a debrief or a short written note. That gives you more room to steer the conversation, but it also lets first impressions, rapport and shared interests weigh more heavily than they should. If you want to see how a multi-interviewer process combines these notes, read how onsite interviews are scored.
Why do employers use structured interviews?
The main reason is that they predict job performance better and treat candidates more consistently. Three sources are worth knowing:
- Schmidt and Hunter (1998). Their widely cited meta-analysis in Psychological Bulletin, summarizing decades of research, estimated the validity of structured interviews for predicting overall job performance at .51, compared with .38 for unstructured interviews (Schmidt and Hunter, 1998, Table 1). Validity here is a correlation between interview scores and later performance ratings, not a percentage.
- Sackett, Zhang, Berry and Lievens (2022). This re-analysis in the Journal of Applied Psychology revised many older estimates downward, but structured interviews still had the highest mean operational validity of the selection methods it reviewed, at .42, with a wide spread around that mean (summary from SIOP).
- OPM guidance. OPM states that more structured interviews show higher validity, rater reliability and rater agreement, and less adverse impact, than less structured ones.
Employers also value structure because it is easier to defend: every candidate got the same questions and was rated on the same scale. None of this means unstructured interviews are useless. They are good for selling the role, answering your questions and judging rapport. Many companies use both.
Semi-structured interviews: the common middle ground
A lot of interviews you will meet are semi-structured. The interviewer has a set of core questions, often tied to competencies, but follows up freely and may reorder topics. A typical example is a hiring manager round that opens with "Tell me about yourself," moves through four prepared behavioral questions and ends with your questions.
You can often spot the type in the first few minutes:
- Signs of a structured interview: the interviewer reads questions from a sheet, explains they will take detailed notes, keeps small talk short, and asks the same probes after each answer.
- Signs of an unstructured interview: the interviewer starts with your résumé, follows tangents and talks about the team at length.
- Signs of a semi-structured interview: a conversational opening, then a clear shift to prepared questions.
How to prepare for a structured interview
- Predict the competencies. Structured questions come from the job's requirements, so the job description is your best guide. List the 5 to 8 skills it stresses most. If the employer publishes a competency framework, use that, as in a competency-based interview.
- Build a story bank. Prepare at least one specific story per competency, with a measurable result. The free STAR story builder helps you write each one.
- Answer completely, the first time. Use the STAR method so the situation, your own actions and the result are all on the record. Do not rely on the interviewer to ask "and what happened?"
- Prepare for hypotheticals. Structured interviews often include situational questions. Practice a frame for "what would you do" questions as well as "tell me about a time."
- Do not read formality as coldness. A neutral interviewer who is writing fast is following the process, not losing interest. Keep your energy steady.
- Keep answers to about two minutes. A fixed list of questions means a fixed clock. Tight answers leave time for every question to be scored.
How to prepare for an unstructured interview
- Choose three points to land. Decide the three things you want the interviewer to remember, such as a skill, a result and your motivation, and look for openings to make each one with evidence.
- Prepare a strong opener. Unstructured interviews often start with "tell me about yourself." A tight 60 to 90 second answer sets the direction of the whole conversation.
- Bring evidence anyway. Even in a casual chat, a specific story with a number beats a general claim. Your STAR stories still work; just tell them more conversationally.
- Ask real questions. In a conversation, your questions are part of the evaluation. Ask about the team's current problems and how success is measured.
- Watch your length. Without a script to keep you on track, it is easy to drift. Pause after each main point and let the interviewer steer.
How to practice structured answers
Structured interviews reward complete answers delivered out loud in about two minutes, which is exactly what practice can fix. You can rehearse a structured round with an AI interview assistant such as CoPilot Interview: its Mock Interview builds questions from your résumé and the job description, reads them aloud, then scores each spoken answer out of 10 with what worked, what to fix and a model answer. It is free for 15 minutes a day, with no account. Follow each employer's rules, and use AI to prepare beforehand.
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Which is better, a structured or unstructured interview?
For predicting job performance, research generally favors structured interviews. Schmidt and Hunter (1998) estimated validity at .51 for structured and .38 for unstructured interviews, and a 2022 re-analysis by Sackett and colleagues still ranked structured interviews highest of the methods it reviewed, at .42.
What is a semi-structured interview?
A semi-structured interview uses a set of prepared core questions but lets the interviewer follow up freely and change the order. It is one of the most common styles in private-sector hiring.
Are behavioral interviews structured?
They often are. Behavioral questions are a common building block of structured interviews, but an interviewer can also ask behavioral questions informally, without a fixed list or rating scale.
Why did my interviewer not ask any follow-up questions?
In a strictly structured interview, interviewers may be limited to set probes so every candidate is treated the same. That is why you should give a complete answer, including your result, without waiting to be asked.
How are structured interview answers scored?
Usually on a rating scale for each question, often 1 to 5, with example answers describing each level. When a panel interviews you, each member typically rates you individually before the group discusses large differences.
How do I prepare for an unstructured interview?
Decide on the three points you want the interviewer to remember, prepare a tight answer to "tell me about yourself," bring specific stories with results, and ask thoughtful questions, since they shape the impression you leave.