ABSTRACT
There are different concepts of task complexity. For example, one can distinguish complexity of design process (Braha and Maimon, 1998), complexity of sociotechnical systems (Vicente, 1999), task complexity, or complexity of task from a behavioral standpoint (Meister, 1999). We will consider task complexity which describes the relationship between the behavioral and physical domains during task performance. Task complexity is a major factor creating a challenge for operator performance. According to Lee et al. (1989) a complex task apparently requires greater use of cognitive and other abilities than simple tasks and, therefore, also influences the relationship between goal and task performance. It is one of the most important integrative characteristics of a task. This characteristic is also critical in determining cognitive efforts needed during task performance.
