NASA TLX Load Index

We asked the user to evaluate the demand of the tasks using the NASA TLX Likert 7-point scale across six categories.

  • Mental Demand: How mentally demanding was the task?
  • Physical Demand: How physically demanding was the task?
  • Temporal Demand: How hurried or rushed was the pace of the task?
  • Performance: How successful were you in accomplishing what you were asked to do?
  • Effort: How hard did you have to work to accomplish your level of performance?
  • Frustration: How insecure, discouraged, irritated, stressed, and annoyed wereyou?

The lower an index is, the more demanding (worse performing) the user finds the task.