On quantification of different facets of uncertainty

With a brief introduction to three major types of uncertainties, randomness , nonspecificity and fuzziness we discuss various attempts to quantify them . We also discuss several attempts to quantify total uncertainty in a syste m. We then talk about some new facets of uncertainty like, higher-order fuz zy entropy, hybrid entropy and conflict in a body of evidence. In conclusio n, we indicate some other aspects of uncertainty that need to be modeled an d quantified. (C) 1999 Elsevier Science B.V. All rights reserved.