NASA-TLX

[5] These descriptions are as follows: The second part of TLX intends to create an individual weighting of these subscales by letting the subjects compare them pairwise based on their perceived importance.

It is these successive ratings that are then scored using the original pairwise questions as weighting factors, that leads to an understanding of the overall workload change.

One study showed that a paper-and-pencil version led to less cognitive workload than processing the information on a computer screen.

[12] However, other studies found that computer screen versions, as well as on wearables, can nonetheless stably capture relative changes in workload.

A feature found in the Official NASA TLX App is a new computer interface response rating scale, termed a Subjective Analogue Equivalent Rating (SAER) scale, that provides the closest possible user experience to that found in the paper and pencil version of NASA TLX.

No other computerized version of the NASA TLX has successfully implemented this critical element for properly capturing a user subjective input.