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Fig. 2.3 In this interface the airline presents flight information using calendar dates. On the left
is the 3 day view, in the center is a 3 week view, and on the right is a year view. Whereas the user
most likely wants to view flight dates (with a pointer to the last, or next available flight, e.g.,
something like ''there are no flights available for the period you have selected, the nearest
available dates are October xx 2013 and April yy 2014''). This interface offers hints and
encourages the user to search repeatedly rather than do the search for the user
2.2.1.2 Error Ergonomics
Error ergonomics is the study and explanation of human error in systems. The zero
defects approach assumes that human error is the result of inadequate motivation, c.f.
the examples of accidents and error attribution including the official report on Kegworth
noted in the Appendix. Reason ( 1997 ) describes this as the person model or person
approach. This approach tends to result in campaigns for safety procedure training and
for safety oriented materials. These drives attempt to raise awareness and incentives for
the workers. Even during the World War I, where the work force was highly motivated,
error ergonomists discovered that fatigue was a major cause of errors.
Similarly, the error data store approach, which forms a part of methods like
THERP (Technique for Human Error Rate Prediction, Swain & Guttman, 1983 )
assumes that human error is inevitable (this is discussed further in Chap. 10 ). This
approach produces data banks of error probabilities for a variety of tasks executed
under various conditions. It is therefore necessary to predict the incidence and
consequences of human errors in any given situation. The results inform the design
of systems in a way that minimizes the occurrence and effects of errors.
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