In a proper test, the goal isn’t to discover everything that can go right. Rather, the goal is to discover everything that can go wrong and to find the breaking point.

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The best way to determine an object’s breaking point is to break it.

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Testing can help turn unknowns into knowns.

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All it takes is a willingness to design tests for the worst-case—rather than the best-case—scenario.

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When you make a last-minute change to a product and ship it out the door without retesting the whole thing, you’re risking disaster.

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“The more you sweat in peace, the less you bleed in war.”

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“The truth is that nothing went as we’d planned,” he responded, “but everything was within the scope of what we prepared for.”

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“You don’t race on a treadmill with Netflix in front of you,” Boone says, “so you shouldn’t be doing your training like that.”

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“Nice to see you again. Let’s dance.”

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when it comes to reporting their own behavior, people tend to bend the truth.

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instead of creating artificial testing environments disconnected from reality, we’re better off observing customer behavior in real life.

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“If you want to improve a piece of software,” as IDEO’s founder David Kelley explains, “all you have to do is watch people using it and see when they grimace.”

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Observing people, it turns out, tends to affect how they behave.

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The act of observation disturbs humans in a different way. When people know they’re being observed, they behave differently.

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Test as you fly—subject yourself to the same conditions you’ll experience during the flight—and you’ll soon begin to soar.

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If we aren’t guaranteed to win, we assume the game isn’t worth playing. This natural tendency to avoid failure is a recipe for failing.

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If failure weren’t an option, we never would have dipped our toes into the cosmic ocean.

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Doing anything groundbreaking requires taking risks, and taking risks means you’re going to fail

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Elon Musk says. “Failure is an option here [at SpaceX]. If things are not failing, you are not innovating enough.”

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took Dyson fifteen years and 5,126 prototypes to get his revolutionary bagless vacuum to work.

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