Success is much harder to analyze than failure. When things go wrong in a chemical plant or space program, it's usually possible to figure out the causes and resolve to avoid those things in the future. But when things go right, it's difficult to know why. Which factors were important to the success, and which weren't? Was the success due to skill, or just luck? If we are to learn to deal with hazardous technologies, our best bet is to look for organizations that manage risk successfully and see how they do it.

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