Expert systems incorporate both rules and confidence levels

• Conclusions in system based on rules
• Rule includes confidence that conclusion is true
  • 1000 indicates conclusion certain to be true
  • 0 indicates conclusion completely uncertain
  • -1000 indicates conclusion certain to be false
• When different sources give contradictory results
  • Rule might state plausible conclusion with reduced certainty
  • Multiple rules might state alternative conclusions
  • Might rely on other data, ignoring the inconsistent inputs
• Drop result when certainty becomes too low

created May 1, 2003 last revised May 1, 2003

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