Anyone with any interest in error reduction, or in the way humans interact with technology should start here. The psychological analysis of how and why we commit errors is fascinating, and influences the way one thinks about daily events. I find myself saying "Aha, that was a capture error," and "Damn! I've fallen for the fundamental attribution error again." The real lesson is that errors derive from the very nature of human behavior--the mechanisms which enable us to solve complex problems also make errors inevitable. This realization changes entirely one's concept of industrial accidents and medical mistakes.