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Subjective
Workload Analysis
Subjective
rating scales are the most widely used workload assessment tools.
The advantages of subjective workload assessments are ease of implementation,
low cost, and limited intrusion on task performance. They are also
useful in evaluating the potential for task overload among competing
interface designs. They can be applied during the design process
with mock-ups, prototypes, and simulators, as well as to assess
workload on existing systems. These questionnaires or rating scales
are filled out by the worker and target the worker's personal estimation
of workload. Two subjective rating tools frequently used in aviation
and other safety-critical environments are:
- NASA-TLX
- The NASA Task Load Index (TLX) incorporates six subscales: mental
demand, physical demand, temporal demand, performance, effort
level, and frustration level.
- SWAT
- The Subjective Workload Assessment Techniques (SWAT) has subscales
assessing loads for time, mental effort, and psychological stress.
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