Table 1.

Explanation of Each Dimension of Workload in NASA-TLX Based on Hart (2006)

Sub-dimensions of workload	Explanation
Mental demand	Perceived mental and perceptual activity required by an individual to accomplish a given task (e.g., thinking, deciding, calculating, remembering, looking, searching).
Physical demand	Perceived physical activity required by an individual to accomplish a given task (e.g., pushing, pulling, turning, controlling, activating).
Temporal demand	Perceived time pressure due to rate or pace of the given task.
Effort	Perceived level of work (mental and physical) to realize performance level.
Performance	Perceived success in accomplishing the goals that are tied to the performed tasks.
Frustration	Perceived insecurity, discouragement, irritation, stress and annoyance versus perceived security, contentment, relaxation and complacency during task performance.