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Structure of Expert Systems
Database of facts
This holds the user's input about the current problem. The user may begin by entering as much as they know about the problem or the inference engine may prompt for details or ask whether certain conditions exist. Gradually a database of facts is built up which the inference engine will use to come to a decision. The quality and quantity of data gained from the user will influence the reliability of the decision.
The following form gives a very simple example of how a database of facts might be built up in an expert system to identify types of animals. Known facts would be entered.
Animal-ID
Backbone: Yes No
Body parts: Two Three Four
Outer body:
Hair
Feathers
Scales
ExoskeletonNumber of legs:
Two
Four
Six
Eight
Eight
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