Abstract
A general theoretical model of tasks is presented in which the three essential components of all tasks are products, (required) acts, and information cues. These components are defined and are then used to derive three analytical dimensions of task complexity: component complexity, coordinative complexity, and dynamic complexity. Various indexes which can be used in the quantification of these constructs are also presented. Two examples which illustrate the calculation of some of the indexes for a relatively simple task and a relatively complex task are presented and the relationship between task complexity and task performance is briefly discussed. (Author/publisher)