Jerry Weinberg has suggested that “it works” may mean “We haven’t tried very hard to make it fail, and we haven’t been running it very long or under very diverse conditions, but so far we haven’t seen any failures, though we haven’t been looking too closely, either.” In this pessimistic view, you have to be on guard for people who say it works without checking even once to see if it could work.

“No user would do that” really means “No user I can think of, who I like, would do that on purpose.”

Who aren’t you thinking of?

Who don’t you like who might really use this product? What might good users do by accident?

In general it can vastly simplify testing if we focus on whether the product has a problem that matters, rather than whether the product merely satisfies all relevant standards. . . . Instead of thinking pass vs. fail, consider thinking problem vs. no problem.