perception
Aesthetic-usability effect
People perceive attractive designs as more usable than they measurably are – and forgive real flaws in things they find beautiful.
Hand someone two objects that work identically, one prettier, and they’ll report the ugly one as harder to use – genuinely believe it, not just prefer the other. The original study (Kurosu & Kashimura, Hitachi, 1995) tested 26 ATM layouts on 252 people: ratings of beauty tracked perceived ease of use more strongly than they tracked measured ease of use. Beauty gets read as competence.
Two practical edges. It has a ceiling – polish buys forgiveness for minor friction, never for a broken flow. And it cuts against you in research: a charmed tester softens criticism you needed to hear, which is why a gorgeous demo deserves more scepticism about its flows, not less.