When I was in Sweden, the one hospital I visited had an automated coffee machine that made a variety of drinks. In getting a cup of coffee, or trying, I found an example of everyday error proofing. When I first put the mug under the spout and pressed the coffee button, nothing happened. I thought the machine was broken, so I tried its twin sitting to the right. Same problem. Then, I realized, I had … Continue reading A Coffee Machine that’s Mistake Proofed