This study examines the abilities of three subjective measures of workload to predict dual task performance. The measures compared are: The Workload Profile (WP), the Multiple Resources Questionnaire (MRQ), and the Global Rating Questionnaire (GRQ). Each of these measures is based on a different theoretical model of cognitive workload. Participants first played three computer games. They were asked to rate the games on subjective workload using all three measurement indices. Subjects were then asked to play pairings of the games simultaneously. Only the MRQ significantly predicted task interference, and it also showed the least variability over participants.
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