A truly intelligent system must be able to learn from its environment. In the case of an expert system this will by interaction with the user. How smart is a program that asks the same question twice going to look?
Several systems that learn have been implemented. Perhaps one of the most sucessful is the system that learns decision trees. This system now called C4.5 is due to Ross Quinlan. It is described in detail in his book of the same name. The System is available on gradsun4:/mlocal/R5+/C4.5.
Systems that learn form example are presented with a sequence of examples marked as either positive or negative. Each time they are unable to expalin the example they modify their current hypothesis.
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