The halo effect
One salient positive trait colours the assessment of unrelated traits. In hiring, the impressive credential, the strong first answer or the fluent presentation lifts every score that follows.
Evidence grade: research Peer-reviewed or large-sample empirical work supports it.
Use it when
Designing any evaluation. It is why each criterion is scored independently before discussion, and why debriefs start from the divergent scores instead of overall impressions.
Where it stops working
Structure reduces the effect without removing it. A panel that resembles the manager brings it back as affinity.
Where the standard uses it
- PL-3Hiring and onboardingStructured evaluation, calibrated standards, assessing capability rather than tool access.
Sources
- Edward L. Thorndike. A Constant Error in Psychological Ratings. Journal of Applied Psychology, 4(1), 25–29, 1920. In the bibliography
Used alongside it
- Calibration practice
- Hiring as a system practice
- Structured interviews research
- The first ninety days practice
Cite this model
Chicago, BibTeX and licence →Engineering Management Academy. (2026). The halo effect. In Engineering Management Academy Body of Knowledge (Version 3.1, TEC.halo-effect). https://www.engineeringmanagement.academy/body-of-knowledge/techniques/halo-effect