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Cognitive biasEstablished researchIntermediate

Halo Effect

A strong impression in one area spills over into unrelated judgements about the same thing.

Definition

Identified by Edward Thorndike in 1920, the halo effect is the tendency for an overall impression, or a salient positive trait, to influence evaluations of unrelated attributes.

Established research. Originates in published research and has been replicated. The effect is real. Its size in your product still needs measuring.

On this page
  1. Definition
  2. How it operates in product judgement
  3. Practical implications
  4. In practice
  5. Sources
  6. Continue from here

How it operates in product judgement

A polished visual surface raises ratings of reliability, security and speed, none of which it touches. A single spelling error on a payment page lowers perceived security. Neither judgement is rational and both are consistent.

This is closely related to the aesthetic-usability effect, and it is the reason craft on trust-sensitive surfaces has measurable commercial consequences.

Practical implications

  • Invest in the surfaces where trust is being decided: payment, signup, security settings, first-run.
  • Fix small visible defects on those surfaces first. Their cost is out of proportion to their size.
  • In research, separate perception measures from performance measures, since the halo contaminates the first.
  • Do not let a strong first impression stop you from measuring the rest of the experience.

In practice

Typos on payment pages

Checkout

A single visible error on a payment screen reduces perceived security noticeably. The correlation with actual security is zero, and the commercial effect is not.

Landing page polish shaping product perception

Marketing

A well-crafted marketing site raises expectations of the product's quality. When the product does not meet them, the gap itself becomes a problem, so the two need to be in proportion.

Sources

Where a source establishes something narrower than the popular reading of it, the note says so.

  • A constant error in psychological ratings

    E. L. Thorndike, Journal of Applied Psychology, 1920

Continue from here

Each link says what the connection is, so you can tell a principle from an alternative from a thing people mix this up with.

Explains

The mechanism underneath these entries.

Applied through

Where this shows up as a concrete interface decision.

Practical example

A worked decision where this was the deciding factor.

Related concept

Connected closely enough to change how you apply this.