16.2 EXPERT SYSTEMS
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To implement an expert system, a knowledge engineer will talk to `experts' about how they solve a problem. The Knowledge engineer will then try to develop a set of rules for solving the problem. After the rules are done, they are entered into Expert System Software ($0 - $20,000). Expert system software will then ask questions (or check sensors, or look at data files) to compare rules to conditions, and see the results.
The rules are in the form shown on the other page
There are two ways to search rules,
Forward Chaining - Consider what you know now, then check rules to see if all conditions are satisfied. The Results of the rule give you a new conclussion. The rules are all checked again using the Results from the previous rule. This is often used for choosing an action.
Backward Chaining - This method will backtrack from a set of consequents to find which conditions caused them. This method is often used for determining how something was done.
