Describes the Performance-Centered Design (PCD) approach that tackles the usability dilemma of computer systems. Discusses PCD success factors; characteristics of adult learning incorporated into PCD methodology; PCD design techniques; interface requirements; and benefits of the PCD methodology. (AEF)

Discusses the design of an innovative learning system that uses new technologies for the man-machine interface, incorporating a combination of Automatic Speech Recognition (ASR) and Text To Speech (TTS) synthesis. Highlights include using speech technologies to mimic the attributes of the ideal tutor and design features. (AEF)