Abstract
A research and development project is under way to specify, design, construct, and evaluate a user interface system to meet the unique requirements of a delivery vehicle for a knowledge-based system applied to gas turbine electronics maintenance and trouble-shooting. The prototype user interface is a portable device with text display, video and overlay graphics display, voice recognition and speech production, special-function keypad, and printer. A modular software structure based on a serial communications protocol between user interface device and expert system host computer provides flexibility, expandability, and a simple, effective user interface dialog. A human factors field evaluation is being conducted to assess aspects of system usability: device hardware, system operability, information presentation effectiveness, and user training.
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