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Defining workload in the context of driver state detection and HMI evaluation

Workload is a dynamic concept that can have different meanings depending on the investigative perspective and the question being asked. Awareness of these methodological distinctions is essential when interpreting research and human machine interface evaluations. Understanding workload within the contexts of objective demand vs. effective workload, physical vs. mental workload, task pacing, automation, technology education, measurement context and distraction are among the themes raised in this brief review.