Preface to first edition
A few years ago, my son approached me with a problem. It was November, daylight savings time had ended, and his watch was an hour fast. He was having trouble adjusting the time. Could I help? “Sure,” I said. He gave me the watch. By most measures, I am an expert in user interfaces. Modern watches have many features and just a few buttons. They have modes. I understand modes. Repeatedly press one button to cycle through the modes. Press and hold another button and the device is ready for change. That sort of thing. It might take some trial and error, but the task seemed simple enough. I was wrong. Try as I may, the watch resisted. I couldn't change the time! I borrowed the watch and brought it to work. ...
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