Processing Requirements for Forward Chaining

• Want to check all rules
  • Need to know (enter) all data initially
  • Hard to know if rule applies if data unknown
• Search not guided
  • Do not know if rule will be useful until final conclusion found
  • May reach many true, but irrelevant, conclusions
  • No way to know if working in appropriate direction until done

Processing Requirements for Backward Chaining

• Potential for considerable record keeping
  • Must keep track of possible hypotheses
  • Must ask for data, if not already known
  • Might work backwards, only to find path ends in unknowns

created May 13, 2003 last revised May 13, 2003

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