ABSTRACT
Not only time study but also error analysis is important in design. Analysis of errors in the system is an important source of evaluation of correctness of the design solutions.
A lot of interesting data were obtained when analyzing human errors in cognitive psychology (Norman, 1988; Reason, 1990; Senders and Moray, 1991, etc.). In this section, we present some new aspects of human error analysis that can be utilized in man-machine and computer-based systems. The systemic-structural activity theory (SSAT) approach is the basis for this analysis. Human errors can occur in different types of tasks performed by an operator. Errors are a potential source of hazard on human health and malfunctioning of the technical components of a system. We distinguish operator errors from operator failures based on the criticality of the errors. If human actions do not lead to unacceptable deviations or variations in the functioning of the system, do not lead to personal injury, and only lead to the deterioration of the system and staff functioning, they are regarded as errors. Errors very often are reversible or one that can be corrected without signicant consequences. Irreversible errors are the main reasons for deterioration of product quality and decreasing productivity.
