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The Design of Everyday Things: Revised and Expanded Edition by Don Norman

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CHAPTER FIVE

HUMAN ERROR? NO, BAD DESIGN

Most industrial accidents are caused by human error: estimates range between 75 and 95 percent. How is it that so many people are so incompetent? Answer: They aren’t. It’s a design problem.

If the number of accidents blamed upon human error were 1 to 5 percent, I might believe that people were at fault. But when the percentage is so high, then clearly other factors must be involved. When something happens this frequently, there must be another underlying factor.

When a bridge collapses, we analyze the incident to find the causes of the collapse and reformulate the design rules to ensure that form ...

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