document: New developments in inductive learning Any intelligent system , whether natural or artificial , must have three characteristics : knowledge , reasoning , and learning . Artificial intelligence -LRB- AI -RRB- studies these three aspects in artificial systems . Briefly , we could say that knowledge refers to the system 's world model , and reasoning to the manipulation of this knowledge . Learning is slightly more complex ; the system interacts with the world and as a consequence it builds onto and modifies its knowledge . This process of self-building and self-modifying is known as learning . This thesis is set within the field of artificial intelligence and focuses on learning . More specifically , it deals with the inductive learning of decision trees
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