A candidate gives an excellent presentation. By the end of the interview, the panel is also confident in their planning, judgment, and ability to manage people.

But did the interview actually establish those strengths?

That leap illustrates the halo effect in hiring: One favorable impression can influence judgments about qualities that still need to be assessed.

What Is the Halo Effect?

The halo effect occurs when an overall impression influences judgments about someone’s individual attributes (Nisbett & Wilson, 1977).

In hiring, it can mean allowing a strong rating in one area to inflate ratings in others. The U.S. Office of Personnel Management (OPM, 2008) identifies this as a common interview rating error.

A candidate may genuinely be strong in several areas. The question is whether each rating has its own supporting evidence.

Examples of the Halo Effect in Hiring

These hypothetical examples show how the pattern could appear:

• Presentation becomes proof of leadership. A candidate explains an idea clearly, and the interviewer assumes they can also resolve team conflicts without asking for examples.

• A recognizable employer becomes proof of individual performance. A hiring manager sees a respected company on a résumé and assumes the candidate consistently delivered excellent results.

• One excellent answer lifts the entire scorecard. A candidate gives a strong technical answer, and the panel awards high scores for collaboration and organization despite limited evidence for either.

The positive information may be relevant. The problem begins when it substitutes for evaluating other requirements.

What Does Research Tell Us?

In a classic experiment, Nisbett and Wilson (1977) showed college students one of two recorded interviews with the same instructor. In one version, he appeared warm and friendly; in the other, cold and distant.

Students’ impressions influenced their ratings of his appearance, mannerisms, and accent. Participants did not recognize the influence of their overall evaluation on those ratings.

This was an experiment about person perception, not a hiring study. It illustrates the mechanism without establishing how often it affects recruitment today.

Employment-interview research addresses the practical response. Levashina et al. (2014) reviewed research on interview structure, including bias, question design, and rating scales. Their review also identified unresolved questions, so structured interviewing should not be presented as a guarantee of bias-free decisions.

Why Does This Matter for Fair Hiring?

For employers trying to reach a broader talent pool, evaluation is where fair opportunity becomes concrete.

Consider the résumé example above. A candidate from a less recognizable organization could offer stronger evidence of the required skills. If employer reputation has already shaped the assessment, the hiring team should pause and compare what each person actually demonstrated.

This is a practical implication of the halo effect: A positive impression deserves examination before it becomes a hiring conclusion.

How Can Employers Limit Its Influence?

OPM’s structured-interview guidance calls for predetermined questions asked in the same order, with responses evaluated against a shared rating scale and standards (OPM, n.d.).

Employers can build on that structure through the following practices described in OPM’s practical guide:

1. Define the competencies first. Identify the job requirements the interview will assess.

2. Set scoring benchmarks. Describe what different levels of performance look like before evaluating candidates.

3. Score each competency on its evidence. Record the relevant answers and behaviors supporting each rating.

4. Rate independently before panel discussion. Have interviewers form their own assessments, then discuss differences using their notes.

5. Train interviewers to recognize rating errors. Include halo effects and premature judgments in preparation.

(OPM, 2008)

A useful editorial check for the final discussion is: “If we removed the detail that impressed us most, what evidence would still support this score?”

Final Thoughts

The halo effect is a reminder to be precise about what a candidate has demonstrated.

An impressive answer can support a strong rating for the competency it addresses. Other requirements still deserve their own assessment.

For employers, that means connecting hiring decisions to clear criteria and documented evidence, giving candidates a fair opportunity to show what they can do.

For employers: Connect with candidates from a broader talent pool through Diversity.com.

For job seekers: Explore job opportunities on Diversity.com and prepare specific examples of the skills each role requires.

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Sources & References

• Levashina, J., Hartwell, C. J., Morgeson, F. P., & Campion, M. A. (2014). The structured employment interview: Narrative and quantitative review of the research literature. Personnel Psychology, 67(1), 241–293. https://doi.org/10.1111/peps.12052

• Nisbett, R. E., & Wilson, T. D. (1977). The halo effect: Evidence for unconscious alteration of judgments. Journal of Personality and Social Psychology, 35(4), 250–256. https://doi.org/10.1037/0022-3514.35.4.250

• U.S. Office of Personnel Management. (2008, September). Structured interviews: A practical guide. https://www.opm.gov/policy-data-oversight/assessment-and-selection/structured-interviews/guide.pdf

• U.S. Office of Personnel Management. (n.d.). Structured interviews. https://www.opm.gov/policy-data-oversight/assessment-and-selection/structured-interviews/