NASA-TLX

The NASA Task Load Index (NASA-TLX) is a widely used,[1] subjective, multidimensional assessment tool that rates perceived workload in order to assess a task, system, or team's effectiveness or other aspects of performance (task loading). It was developed by the Human Performance Group at NASA's Ames Research Center over a three-year development cycle that included more than 40 laboratory simulations.[2][3] It has been cited in over 4,400 studies,[4] highlighting the influence the NASA-TLX has had in human factors research. It has been used in a variety of domains, including aviation, healthcare and other complex socio-technical domains.[1] It is a subjective self-reporting set of scores, and is not an objective measure of the Task Load that should be measured using objective metrics that examine the product of the speed and accuracy of users performing a task.