Power-based Strategy: Use the speed and power of the computer to derive answers to problems by search, starting from a small number of first principles.

Knowledge-based Strategy: Expertise in solving problems is derived from large amounts of knowledge. The computer must similarly embody knowledge to be a good problem solver.

The knowledge-based strategy raises several questions:

• What is the knowledge that underlies expertise?

• How can the knowledge be expressed?

• How can the knowledge be used to solve a new problem?

• How much must the user know and say in order to make use of the computer's knowledge?

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