Two new techniques are described, one using subjective, the other physiological data for the measurement of workload in complex tasks. The subjective approach uses fuzzy measurement to analyse and predict the difficulty of combinations of skill based and rule based behaviour from the difficulty of skill based behaviour and rule based behaviour measured separately. The physiological technique offers an on-line real-time filter for measuring the Mulder signal at 0.1 Hz in the heart rate variability spectrum.
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