Interval-Valued Degrees of Belief: Applications of Interval Computations to Expert Systems and Intelligent Control

Usually, expert systems use numbers to describe the experts’ degrees of belief in their statements. In practice, however, it is difficult to assign an exact numerical value to the expert’s degree of belief. At best, we can get an interval of possible values. This fact leads to the use of interval-valued degrees of belief. When intervals are used to describe degrees of belief, then computations with intervals must be used to process them. In this paper, we describe applications of such interval computations to expert systems and to intelligent control.