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The Official NASA Task Load Index (TLX) is a subjective workload assessment tool which allows users to perform subjective workload asessments on operator(s) working with various human-machine interface systems. Originally developed as a paper and pencil questionnaire by NASA Ames Research Center’s (ARC) Sandra Hart in the 1980s, NASA TLX has become the gold standard for measuring subjective workload across a wide range of applications.
By incorporating a multi-dimensional rating procedure, NASA TLX derives an overall workload score based on a weighted average of ratings on six subscales:
- Mental Demand
- Physical Demand
- Temporal Demand
- Performance
- Effort
- Frustration
NASA TLX has been successfully used around the world to assess workload in various environments such as aircraft cockpits; command, control, and communication (C3) workstations; supervisory and process control; and simulations and laboratory tests.
Current Version
The Official NASA TLX continues to be available as a paper and pencil version in PDF format, which also contains background information and a user manual for its use.
TLX Mobile App
To meet a growing demand for the Official NASA TLX, it is now available as a brand new mobile app on the App Store for iPhone, iPad, and iPod touch. Click the button on the left side of this page to download the app. Additionally, NASA TLX will soon be available for the Mac on the Mac App Store.
Other Resources
Additionally, access to NASA TLX publications is available to provide insight into how NASA TLX has been applied in a variety of research applications. If you have used NASA TLX and would like to add to our publications database, please contact us. |
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