ABSTRACT
Most of the conventionally applied Human-ReliabilityAssessment (HRA) methods are based on an event orientated categorizing system. They provide reliable prognosis for so-called skilled-based actions, which are often enough repeated. In the case of cognitive tasks they cannot support sufficient data. The HCR (human cognitive reliability) methods classify human error as belonging only to the ratio of time available to time required. As system ergonomics deals with the information flow in a man machine system (Figure 1) as well as with the information flow between different systems, this would serve as a base to assess human reliability independent to the level of information processing.
