Biases and effectsEdward Thorndike, 1920
One good quality makes unrelated qualities look good too. Why the good-looking person's proposal gets approved.
Army officers were asked to rate their men on physique, intelligence, leadership, character and so on. The traits should have varied independently. The ratings all moved together. A soldier rated well-built was also rated intelligent and of good character.
Thorndike called it a halo: one strong impression becomes a ring of light that illuminates every other judgment.
It runs the other way too — one bad impression darkens unrelated traits (some call that the horns effect).
People want one summary impression of a person. Keeping separate scores per trait is expensive for the mind.
So the first strong signal — looks, title, manner, background — becomes the overall grade, and later information is read to fit it. With confirmation bias alongside, the impression sets.
Appearance is especially powerful: the same essay is rated better when it comes with a more attractive photo of the writer.
Separate the traits and score them separately, ideally at different times. In an interview, do not judge "how they speak" and "what they have done" in the same five minutes.
Hide the source of the impression. The famous case: orchestras auditioning behind a curtain saw women's success rates jump. Do not look at what you do not need to see.
If you are the one being judged, craft the first signal carefully. Halos can be built: clean clothes, arriving on time, remembering names. They work before the substance does.
The big-company name on the CV
One famous employer on the CV and everything about the person looks competent. What they actually did there is rarely asked.
The 4.8-star listing
A highly rated product gets its description read with trust. The same text under 3.2 stars reads as full of holes. You are reading the stars, not the words.
Love at first impression
Start with "seems nice" and their later lateness reads as "busy". Start badly and the same lateness reads as "sloppy". The lateness did not change.
If you take one thing
What feels like evaluation is often just confirming the first impression. Separate the traits, separate the moments. The halo fades on its own.
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