Expert Systems
Programming languages like C, C++, FORTRAN, BASIC are procedure based which are not suitable for handling day-to-day situations. To counter this problem, a rule-based system was conceptualized, which employed human logic in evaluating different situations. Expert systems are programs designed to provide users the expertise of professionals in a particular field. Figure illustrates the basic components of a simple expert system.
The system's knowledge base consists of facts, procedural steps, and rules that determine how the data is related to the solution and other relevant information. The rules are framed on the basis of the methods used by professionals for solving problems (This information is arrived at by conducting extensive interviews with experts).
Figure: Basic Components of an Expert System
An expert system consists of an inference engine, which is a program that enables the system to evaluate the rules in the knowledge base. It determines the set of rules that will be invoked based on the nature of the problem. As the code of the inference engine is separate from that of the knowledge base, a single inference engine can be used to drive different knowledge bases. The systems are generally provided with a language interface that permits the user to interact with the system.
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