Back to Tools
Workload Assessment Tool

NASA Task Load Index (NASA-TLX)

GitHub Repository(opens in a new tab)

Evaluate multidimensional workload across 6 subscales: Mental, Physical, Temporal, Performance, Effort, and Frustration.

Instrument version, scoring, and data handling

Version: Raw TLX and weighted NASA-TLX across six workload dimensions.

Scoring: Raw TLX averages the six ratings; weighted TLX applies the 15 pairwise-comparison weights.

Data handling: CSV mode creates a file only on this device; the portfolio server does not receive the response. Google Sheets mode sends the participant ID, condition, item responses, calculated scores, tool name, sheet/tab name, and timestamp to the Google Apps Script /exec URL entered by the researcher. Nothing is sent until the final save action. Completion is shown only when that script returns JSON with success: true (or ok: true) after appending the row.

Select Evaluation Method

Data Save Option

This URL is remembered only in this browser on this device.

Workload Subscale Ratings (0 - 100)

Move each slider to rate the workload experienced for each dimension.

Mental Demand

How much mental and perceptual activity was required? (e.g. thinking, deciding, calculating, remembering, looking, searching)

50
Low (0)High (100)
Physical Demand

How much physical activity was required? (e.g. pushing, pulling, turning, controlling, activating)

50
Low (0)High (100)
Temporal Demand

How much time pressure did you feel due to the rate or pace at which the tasks or task elements occurred?

50
Low (0)High (100)
Performance

How successful do you think you were in accomplishing the goals of the task set by the experimenter?

50
Low (0)High (100)
Effort

How hard did you have to work (mentally and physically) to accomplish your level of performance?

50
Low (0)High (100)
Frustration Level

How insecure, discouraged, irritated, stressed and annoyed versus secure, gratified, content, relaxed and self-satisfied did you feel?

50
Low (0)High (100)