1988 Volume 24 Issue 12 Pages 1312-1319
This paper presents a method to represent human reliability in terms of the error possibility which is a fuzzy set on [0, 1]. This method considers not only the error rate but also many factors, e.g., task conditions, stress level, aptitude, etc. These factors affect human performance.
First of all three kinds of experiments on a microcomputer have been performed. The qualitative expression concerned with human reliability is obtained by the analysis of the experimental result. Based on the qualitative expression human reliability is estimated by many factors, i.e., task conditions, stress level and aptitude. Lastly the method to obtain the error possibility by fuzzy reasoning is presented on the assumption that the basic error rate is given.
As an illustrative example the wrong selection from a functionally grouped set of manual controls is considered. It is shown that the error possibility obtained by the present method represents well the experimental result and the human reliability estimated in an accident.
