This clever idea is not a mistake-proofing device in the purest sense. However, rapid feedback is a guiding principle in mistake-proofing and this switch in a discount store restroom seems to fully exemplify that idea.
This clever idea is not a mistake-proofing device in the purest sense. However, rapid feedback is a guiding principle in mistake-proofing and this switch in a discount store restroom seems to fully exemplify that idea.
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