Hart, S. G., & Staveland, L. E. (1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. In Advances in psychology (Vol. 52, pp. 139-183). North-Holland.

Johns Hopkins University

A measurement of human workload. Contains six question items: mental demand, physical demand, temporal demand, performance, effort, and frustration. Assign weights to answers according to task type. 

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