You don’t need to know everything. As with any field, there’s a lot you could learn about usability. But unless you’re a usability professional, there’s a limit to how much is useful for you to learn.5 5 I’ve always liked the passage in A Study in Scarlet where Dr. Watson is shocked to learn that Sherlock Holmes doesn’t know that the earth travels around the sun. Given the finite capacity of the human brain, Holmes explains, he can’t afford to have useless facts elbowing out the useful ones: “What the deuce is it to me? You say that we go round the sun. If we went round the moon it would not
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