For over 20 years, the NASA Task Load indeX (NASA-TLX) (Hart & Staveland, 1988) has been successfully used as a self-report measure of cognitive workload, yet emphasis on the usability and accessibility of the NASA-TLX as a research tool has remained lacking. A freely-available, user-friendly, online version of NASA-TLX is introduced (Sharek, 2009). Key features and benefits of the online version for researchers and participants are discussed.
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