Stochastic Effectiveness Models for Human-Machine Systems

Stochastic models for system effectiveness are developed for a multiple-component human-machine system. System effectiveness is defined as the combined measure of availability and reliability at each task-arrival time, when transient human operator behavior was considered in conjunction with the machine state. Because factors such as fatigue, stress, and learning affect the human operator over time, all probability measures for successful human performance are considered to be time-dependent. Performance evaluation models for a generic military system are developed. The modeling techniques can also be used for large-scale, man-machine systems that consist of modern computers and processors. © 1990 IEEE