Cognitive-modification strategies

The results of CTA are usually cast in the form of graphical representations that incorporate the work demands and user strategies. For cognitive tasks that have been encountered in the past, operators may have developed well-established responses that may need some modifications but nevertheless provide a starting framework. For unfamiliar tasks that have not been encountered in the past or are beyond the design-basis of the system, operators are required to develop new methods or combine old methods in new ways. To illustrate how the results of CTA can be merged in a graphical form, two techniques are presented hierarchical task analysis and the critical decision method. 

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