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We have suggested that wearable computers combined with a performance support system could be a useful resource for mobile workers. Literature provides little guidance as to whether this is a feasible solution for aiding mobile workers in the performance of their tasks. In order to evaluate the feasibility of this concept a small, initial study was conducted. The initial study compared a voice-activated, computer-based performance support system with a book for learning and performing three simple tasks. The study demonstrated the feasibility of a performance support system on a wearable computer, but did not show it to be superior to the book in this context. Guidance on the design of future performance support systems and suggestions for future studies are provided.