Using D-S evidence theory to evaluation of confidence in safety case

A safety case provides an explicit means for justifying the safety of a system through a reasoned argument and supporting evidence. However, the acceptance of a safety case requires the assessors to be confident, thus, there is some uncertainty of confidence in the safety case, and it becomes a key factor how to process the uncertainty in evaluating confidence in safety case. D-S evidence theory is fit for processing the subjective judgment and synthesizing the uncertain knowledge. So, this theory is applied to the uncertainty of assessment results. First, the related knowledge is given, including safety case and D-S evidence theory. Then the approach of evaluating confidence in safety case using D-S evidence theory is presented, and engine software is chosen as experimental example for proposed approach. At the same time, the experimental results based on the proposed approach are also presented. The algorithm has a strong versatility and an example is used to demonstrate its effectively in this text.