Machines are an integral part of our lives, from alarm clocks that awaken us in the morning to computers, information systems, and automated control systems. Most of our interactions with these machines are problem-free, but more often than we would like, they can be irritating and confusing. This is frequently harmless, such as a VCR recording the wrong show, but when it involves critical systems like medical devices, navigation systems, and autopilots--it can be a matter of life or death. In this presentation, which is based on my new book, Taming HAL, I will explain the kind of miscommunications that frequently occur between humans and machines by delineating the differences between models of machine behavior and models of (user) tasks and processes. I will present several examples, from consumer electronic and medical devices to ship navigation and modern autopilot design, in order to illustrate fundamental interface and interactions problems that can plague systems. Using examples from 2001: A Space Odyssey, I will show parallels between HAL's dangerous behavior and current automation design.