Reliability assessment under Uncertainty Using Dempster-Shafer and Vague Set Theories

Epistemic uncertainty also known as, subjective uncertainty, reducible uncertainty and state of knowledge uncertainty and results from the lack of knowledge about a system and is a property of the analysts performing the analysis [2]. Epistemic uncertainty is defined ‘‘any lack of knowledge or information in any phase or activity of the modeling process’’ [3]. This Epistemic uncertainty is not an inherent property of the system but is related to gain of information about the system or environmental factors.