Knowledge Engineering

Initial Attributes and Rules [11]

Step 2: Document the rule-of-thumb that leads to the advice for each case defined in step 1. The rules should be written down in if...then format. As with attribute naming, the expert system shell used to implement the knowledge base will ultimately restrict the format of these rules. For now, getting the logic down on paper is the objective. Some examples:

If the starter does not crank then the recommended action is recharge or replace the battery
If the headlights do not light then the recommended action is recharge or replace the battery
If the starter cranks normally and there is a gasoline smell then the recommended action is wait 10 minutes then restart flooded engine

The first two rules could optionally be expressed as a single rule:
If the starter does not crank or the headlights do not light then the recommended action is recharge or replace the battery
This decreases the size of the knowledge base which might improve the inference engine's performance. A trade off is that a combined rule might be less understandable as part of the explanation of results.

Continued...

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