The NASA Task Load Index (TLX) consists of six dimensions to assess workload: mental demand, physical demand, temporal demand, performance, effort, and frustration. Twenty-step bipolar scales are used to obtain ratings on these dimensions, resulting in a score between 0 and 100. The six scales are combined to create an overall workload scale (0–100). In both studies, the face validity of NASA TLX was tested in a pilot study by asking ICU nurses to fill out the questionnaires (see for example Hoonakker et al. (2011) for an extensive description of the questionnaire development). Reliability (Cronbach’s alpha) of the overall workload scale is 0.72.
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NASA Task Load Index Protocol
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Variable analysis
independent variables
- Not explicitly mentioned
- Mental demand
- Physical demand
- Temporal demand
- Performance
- Effort
- Frustration
- Overall workload scale (0–100)
- Face validity of NASA TLX was tested in a pilot study by asking ICU nurses to fill out the questionnaires
- None specified
- None specified
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