1998 Volume 10 Issue 5 Pages 947-956
In this paper an analysis model of human reliability is presented, which employs natural language and a fault tree. The meaning of linguistic term about human reliability is expressed by a subjective measure of unreliability defined on subjective unreliability [0, 1], and its AND operation and OR operation in a fault tree analysis are defined. Analysis results are expressed by natural language. In this paper a dependency among human tasks and a task procedure are especially considered as important points in a human reliability analysis. There are two kinds of dependencies among consecutive similar tasks that are failure dependency and success dependency. The latter is peculiar to human reliability. The task procedure is often prescribed in tasks. In this case the error in the task procedure must be considered in the analysis. This is also peculiar to human reliability. Finally, human reliability in tasks considering the dependency and the task procedure is analyzed as an example and analysis results are discussed in order to confirm the validity of the presented analysis model.
