Matching Tasks to Human Characteristics

In general, the designer should tailor systems to human requirements instead of the opposite. Engineered systems are easier to change in their behavior than are humans. 

Because humans without direct control tasks will lose vigilance, the design should combat lack of alertness by designing human tasks to be stimulating and varied, to provide good feedback, and to require active involvement of the human controllers in most operations. Maintaining manual involvement is important, not just for alertness but also in getting the information needed to update process models. 

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