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Table 2 NASA-rTLX factors and descriptions ( Hart and Staveland, [1988])

From: Effectiveness of communication of spatial engineering information through 3D CAD and 3D printed models

NASA-rTLX factors Rating scale Description
Mental demand 1-100 (Low-High) How much mental and perceptual activity was required (e.g., thinking, deciding, calculating, remembering, looking, searching, etc.)? Was the mission easy or demanding, simple or complex, exacting or forgiving?
Physical demand 1-100 (Low-High) How much physical activity was required (e.g., pushing, pulling, turning, controlling, activating, etc.)? Was the mission easy or demanding, slow or brisk, slack or strenuous, restful or laborious?
Temporal demand 1-100 (Low-High) How much time pressure did you feel due to the rate or pace at which the mission occurred? Was the pace slow and leisurely or rapid and frantic?
Performance 1-100 (Good-Poor) How successful do you think you were in accomplishing the goals of the mission? How satisfied were you with your performance in accomplishing these goals?
Effort 1-100 (Low-High) How hard did you have to work (mentally and physically) to accomplish your level of performance?
Frustration 1-100 (Low-High) How discouraged, stressed, irritated, and annoyed versus gratified, relaxed, content, and complacent did you feel during your mission?