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NASA Task Load Index (NASA-TLX), ready to run

A multi-dimensional rating procedure that assesses perceived workload across six subscales. Widely used in human factors, aviation, healthcare, and HCI research. Two common versions are in use: the original weighted TLX (with pairwise comparisons) and the Raw TLX (unweighted mean of subscales).

6 items · 6 sections · Continuous 0–100 scale (often presented as 21-point visual analog, 0 to 100 in increments of 5)

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The instrument

  1. Mental Demand

  2. 1

    Mental Demand — How mentally demanding was the task?

    Very LowVery High

  3. Physical Demand

  4. 2

    Physical Demand — How physically demanding was the task?

    Very LowVery High

  5. Temporal Demand

  6. 3

    Temporal Demand — How hurried or rushed was the pace of the task?

    Very LowVery High

  7. Performance

  8. 4

    Performance — How successful were you in accomplishing what you were asked to do?

    Very LowVery High

  9. Effort

  10. 5

    Effort — How hard did you have to work to accomplish your level of performance?

    Very LowVery High

  11. Frustration

  12. 6

    Frustration — How insecure, discouraged, irritated, stressed, and annoyed were you?

    Very LowVery High

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← Back to the NASA-TLX reference page · Metadata and item wording are provided for research use; cite the original publication.