Measurement of Human Performance in Complex Task Environments

This article outlines a model of human performance representing an alterna- tive to studying human interaction in complex systems solely as a function of traditional performance measures (i.e., speed- and accuracy-based measures taken from the system itself). The model described was developed to focus on pilot/operator strategies as they are formulated in the context of the task en- vironment. This model facilitated the development of human-system interac- tion (HSI) measures which allow the quantitative assessment of operator strategies, in terms of the functions affected and the sequence of actions taken in response to external challenges. In conjunction with the more tradi- tional pilot performance measures, HSI measures can be used to investigate how strategic responses impact overt performance.