
240 Ergonomics in the Automotive Design Process
TABLE 14.2
Description of the Six Subscales Used in the Measurements of the NASA-Task Load Index
No.
Subscale
(Workload
Attribute)
Adjectives Used to
Describe the Low
and High End
Points of the Scale Questions Used to Describe the Scale Attribute
1 Mental demand Low, high How much mental and perceptual activity was required (e.g.,
thinking, deciding, calculating, remembering, looking,
searching)? Was the task easy or demanding, simple or complex,
exacting or forgiving?
2 Physical demand Low, high How much physical activity was required (e.g., pushing, pulling,
turning, controlling, activating)? Was the ...