In grad school when we learned about human factors and my program was actually human factors and ergonomics. The Industrial Revolution is when what I call time and motion studies started. So for example researchers watched people shoveling coal and determined that there was an optimal weight for how much coal should be in the shovel so that they are as fast and efficient as possible. This is kind of a trend for at least the first bunch of decades of ergonomic chairs and desks and laptops. And now we have User Experience Design or UX which is more about subjectivity involved than anything else.

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