The halo effect is the tendency for a positive impression in one area to influence opinions in other, unrelated areas. One strong trait casts a favorable glow over everything else.

Where It Shows Up

• Attractiveness: Physically attractive people are perceived as more intelligent, trustworthy, and competent — regardless of actual performance
• Brands: A positive product experience makes people rate the company's unrelated products more favorably
• Leadership: Charismatic executives receive credit for company performance even when driven by external factors
• Education: Students who write neatly receive higher grades on content — independent evaluations show this clearly

The Reverse: Horn Effect

One negative trait casts a shadow over everything. A job candidate who arrives late is often rated lower on completely unrelated competencies.

Structural Defense

Evaluate traits independently and sequentially rather than forming a global impression first. Structured interviews and blind evaluations significantly reduce the halo effect.

Reference:

Wikipedia: Halo Effect

https://en.wikipedia.org/wiki/Halo_effect