Example of a common rule based expe

Example of a common rule based expert system
Many useful expert systems use a rule-based approach where a set of rules are established and the user
effectively moves from a starting point to some answer or output by answering a set of questions. Each next
question is dependent upon the last answer or series of answers. There are many thousands of examples of such
systems, and they are now widely used. shows a simple rule based system from the British Medial Association
Family Health Encyclopedia (1997). Listed as interactive diagnostic charts, the program used a flow chart
metaphor to assist the user to self-diagnose problems. The example in shows only the first of a large number of
rule-based questions that eventually lead the user to a simple home remedy or advice to seek further expert help.
More complex versions of this type of program are routinely used by the medical profession for education and
training and as a continuous and updated reference.