Why Learn?

• Understand and improve efficiency of human learning
  For example, use to improve methods for teaching and tutoring people, as done in CAI -- Computer-aided instruction.

• Discover new things or structure that is unknown to humans.
  

  Example: Data mining

• Fill in skeletal or incomplete specifications about a domain.
  Large, complex AI systems cannot be completely derived by hand and require dynamic updating to incorporate new information. Learning new characteristics expands the domain or expertise and lessens the "brittleness" of the system.