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Predicting Dual-Task Performance With the Multiple Resources Questionnaire (MRQ)

University of Alabama, Tuscaloosa, Alabama, dboles{at}bama.ua.edu

Jonathan H. Bursk

Sikorsky Aircraft, Stratford, Connecticut

Jeffrey B. Phillips

University of Alabama, Tuscaloosa, Alabama

Jason R. Perdelwitz

University of Alabama, Tuscaloosa, Alabama

Objective: The objective was to assess the validity of the Multiple Resources Questionnaire (MRQ) in predicting dual-task interference. Background: Subjective workload measures such as the Subjective Workload Assessment Technique (SWAT) and NASA Task Load Index are sensitive to single-task parameters and dual-task loads but have not attempted to measure workload in particular mental processes. An alternative is the MRQ. Method: In Experiment 1, participants completed simple laboratory tasks and the MRQ after each. Interference between tasks was then correlated to three different task similarity metrics: profile similarity, based on r² between ratings; overlap similarity, based on summed minima; and overall demand, based on summed ratings. Experiment 2 used similar methods but more complex computer-based games. Results: In Experiment 1 the MRQ moderately predicted interference (r = +.37), with no significant difference between metrics. In Experiment 2 the metric effect was significant, with overlap similarity excelling in predicting interference (r = +.83). Mean ratings showed high diagnosticity in identifying specific mental processing bottlenecks. Conclusion: The MRQ shows considerable promise as a cognitive-process-sensitive workload measure. Application: Potential applications of the MRQ include the identification of dual-processing bottlenecks as well as process overloads in single tasks, preparatory to redesign in areas such as air traffic management, advanced flight displays, and medical imaging.

Human Factors: The Journal of the Human Factors and Ergonomics Society, Vol. 49, No. 1, 32-45 (2007)
DOI: 10.1518/001872007779598073


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