Conducting Effective Interviews: A Complete Guide

Why Most Interviews Fail

Traditional interviews have a dirty secret: they're not very predictive of job performance. Unstructured interviews—where interviewers ask whatever questions come to mind—are only slightly better than random selection.

The good news? Well-designed interviews can be highly effective. The key is structure.

The Science of Effective Interviewing

Selection research consistently finds that structured interviews predict job performance considerably better than unstructured ones. Structure means:

• Standardized questions for all candidates
• Predetermined evaluation criteria
• Consistent scoring across interviewers
• Job-related content throughout

Before the Interview

Define What You're Looking For

Before interviewing anyone:

1. List the key competencies for success in the role
2. Define what "good" looks like for each competency
3. Create a scoring rubric with specific criteria
4. Align all interviewers on expectations

Design Your Questions

For each competency, create questions that reveal it:

Behavioral Questions: Past behavior predicts future behavior

• "Tell me about a time when..."
• "Give me an example of..."
• "Describe a situation where..."

Situational Questions: How would they handle scenarios?

• "What would you do if..."
• "How would you approach..."
• "Imagine you're facing..."

Technical Questions: Can they do the work?

• Job-specific problems to solve
• Work samples to create
• Technical concepts to explain

Prepare Your Interviewers

Every interviewer should:

• Know which competencies they're evaluating
• Have their questions prepared
• Understand the scoring rubric
• Be trained on bias and legal compliance

During the Interview

Create a Welcoming Environment

Nervous candidates don't show their best:

• Start with small talk to build rapport
• Explain the interview structure
• Offer water and comfort breaks
• Make them feel valued, not interrogated

Ask Questions Effectively

Do:

• Ask open-ended questions
• Use follow-up probes ("Tell me more about...")
• Allow silence for thinking
• Listen more than you talk

Don't:

• Ask leading questions
• Interrupt or rush
• Share what answer you're looking for
• Make assumptions

Take Good Notes

Document what candidates say, not your interpretations:

• Quote specific statements
• Note concrete examples given
• Record facts, not impressions
• Capture enough detail to evaluate later

Watch for Red Flags (and Green Flags)

Green Flags:

• Specific, detailed examples
• Ownership of both successes and failures
• Thoughtful questions about the role
• Enthusiasm balanced with realism

Red Flags:

• Vague or evasive answers
• Blaming others consistently
• No questions about the work
• Badmouthing previous employers

Question Types to Master

The STAR Method

For behavioral questions, probe for:

• Situation: What was the context?
• Task: What was your responsibility?
• Action: What did YOU do?
• Result: What happened?

If candidates give vague answers, probe each element specifically.

Hypothetical Scenarios

Present realistic job situations:

"Imagine you're managing a project and the client suddenly changes requirements mid-way through. How would you handle it?"

Follow up with:

• "What would you do first?"
• "How would you communicate with the team?"
• "What if the client wasn't flexible?"

Technical Assessments

For technical roles:

• Give real problems, not trick questions
• Allow thinking time
• Care more about process than perfect answers
• Ask them to explain their reasoning

Common Interview Mistakes

1. Talking Too Much

Great interviews are 70% candidate, 30% interviewer. If you're talking more, you're learning less.

2. First Impression Bias

Many interviewers form a judgment in the first few minutes. Force yourself to evaluate the full interview.

3. Similar-to-Me Bias

We prefer candidates like ourselves. Actively seek value in different perspectives and styles.

4. Halo/Horn Effect

One positive or negative trait colors our entire evaluation. Score each competency independently.

5. Confirmation Bias

We seek evidence that confirms our initial impression. Challenge yourself to consider contradicting evidence.

After the Interview

Score Immediately

Before discussing with others:

• Score each competency independently
• Note specific evidence for your scores
• Identify questions you still have
• Make a preliminary recommendation

Debrief Effectively

Structure your discussions:

1. Each interviewer shares scores independently first
2. Discuss areas of agreement and disagreement
3. Focus on evidence, not impressions
4. Make decisions based on criteria, not gut feel

Document Your Decision

For every candidate, record:

• Scores on each competency
• Key evidence supporting the decision
• Reasons for hire/no-hire decision
• Any concerns to address in onboarding

Special Interview Situations

Panel Interviews

• Designate a lead interviewer
• Assign different questions to each panelist
• Avoid repeating questions
• Give candidate time to address each person

Virtual Interviews

• Test technology beforehand
• Look at the camera, not the screen
• Eliminate distractions
• Allow for connection delays

Multiple Round Interviews

• Each round should evaluate different things
• Brief subsequent interviewers on what's been covered
• Avoid asking the same questions repeatedly
• Respect the candidate's time investment

Legal Considerations

Avoid questions about:

• Age or date of birth
• Marital or family status
• Religion or religious practices
• National origin or citizenship (except for I-9)
• Disabilities or medical conditions
• Pregnancy or plans for children

When in doubt, ask yourself: "Is this directly related to ability to do the job?"

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AcquireTM's interview scorecards and structured workflow help you conduct more effective, consistent interviews. See how.