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Isn't that skilled labour, rather than knowledge work? A truck driver is operating heavy machinery with his hands

They are also doing route management, time management, fuel management, etc. There are very very few jobs I wound't classify as "knowledge work" these days.

I work in manufacturing as IT and everyone is using computers for all kinds of forecasting and estimating along with running the actual production machinery.

I think “knowledge work” refers to work that solely requires knowledge with no physical labor component and no physical object manipulation (other than a keyboard, mouse, and writing utensil, I guess).

Every job that requires physical labor requires knowledge of how to accomplish the task at hand.

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