"On average, when you ask someone to perform a task on a site, they cannot do it. It's not their fault; it's the designer's fault."

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It is not enough to show that drug A is better than drug B on the average. One is invited to ask, 'For which people ("& why") is drug A better than drug B, and vice versa? If drug A cures 40% and drug B cures 60%, perhaps the right choice of drug for each person would result in 100% cures.'

— Lancelot Hogben