ABSTRACT
This chapter reviews representative applications of secondary-task methodology to multi-task environments and Representative evidence related to applications of each of these tasks in multi-task environments. Choice of a secondary task for application to multi-task environments presents some difficulties not encountered in applications that involve secondary-task assessment of the workload associated with a single primary task. In addition to secondary task metrics, another viable approach to performance-based workload assessment in multi-task environments is represented by primary-task measurement of the operator function of interest. Most applications of Subjective Workload Assessment Technique have involved completion of workload ratings subsequent to performance of a mission segment or task. One of the issues concerns the dissociation of workload ratings and performance, and the second deals with the effect of delayed report on subjective workload ratings. The chapter also explains the hypothetical relationship between primary task performance and operator workload.
