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Taking a Look at Mental Workload

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Mental workload (MWL) has been described as a hypothetical construct that is widely used in studies of human factors and various measurement techniques to evaluate equipment and work systems in terms of the workload experienced by people using them (Gopher, D. and Donchin, E. (1986)). It has been identified that by optimizing the allocations of MWL to individual, human errors can be reduced and lead to increase in system productivity (Xie and Salvendy, 2000, Moray, 1988, Gopher and Donchin, 1986). Over the years extensive researches have been conducted to search for definition of MWL but none of these were widely accepted or quantitatively verified. The most common definition for MWL is as a function of internal capacity that reflects the interaction between attending task demands and capacity imposed on the operator. Capacity is determined by operator's skill, training and influenced by internal factors like stress and fatigue; whereas task demand is identified by number of tasks to perform, task complexity and structure, amount of attention required and time available (Bainbride 1997, Xie and Salvendy 2000). In addition, MWL was described in term of experience load, which indicated that workload is not only task-specific but also person-specific and depends on the interaction between operator and task structure (Schvaneveldt et al, 2004). Following this concept, factors of experience like motivation and effort to perform a task or working difficulty and discomfort would

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