Abstract
The objective of this paper is to review research dealing with the role of complexity in functions and tasks commonly allocated to the operators/users. This topic is complex and not well-structured. We have reviewed principal approaches to provide better structure for the psychological domain of complexity. The research reviewed is partitioned into three categories: procedural, cognitive, and conceptual complexity. What we were after in the review was to find quantifiable attributes of complexity in cognitive tasks and skills and how to use these attributes to manage complexity during system design.
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