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Workload

EM Edward J. Martin
TM Thomas R. Meagher
DB Daniel Barker
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We evaluated the subjective mental workload of the more difficult second task using the NASA Task Load Index (TLX). It is a subjective, multi-dimensional, quantitative assessment tool that assesses the perceived workload of a task [30]. Independent researchers have demonstrated both the reliability and validity of the TLX [31, 32] and its frequent use in the literature [33].

The workload is divided into six sub-scales: Frustration, Effort, (own) Performance, Temporal Demand, Physical Demand, and Mental Demand. Participants rate each of these from 0 (low) to 100 (high) and their scores are rounded to the nearest unit of five. Participants are then given a binary choice between each pair of the six sub-scales and asked to pick which one contributes the most to the workload of the task. These fifteen binary choices are combined with the six ratings and a weighted score is derived.

Copyright and License information: The Author(s) ©2021
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