Wordless assembly instructions

Having just bought and assembled an Ikea office chair, I couldn’t help but marvel at the clarity off their assembly instructions all in the form of sparse, black-and-white line drawings, without a single word. They are easy to follow, almost mistake-proof, cheap to print, and usable worldwide.

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They should be a source of inspiration for operator instructions in a manufacturing setting, with the understanding that additional instructions are needed, like torque specs on the bolts.