Computer designers can use an inexpensive pocket computer to collect data on how people use their products. Users carry the computer with them as they work; at random time intervals it prompts them to enter data about the task they are performing. This technique eliminates most of the tedium and disruption inherent in methods that require observers to keep a log of what they do. In addition, it retains the economy and simplicity of self-logging methods. We are using this system to evaluate users' interaction with computer hardware, software, and documentation.
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