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Production Systems (DENDRAL -1965 (Using heuristics to determine the…
Production Systems
DENDRAL -1965
One of the 1st rule based systems: DENDRAL, developed in Stanford in 1965 by Edward Feigenbaum and his team
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MYCIN -1970s
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Typical rule:
IF the stain of the organism is gram-positive AND the morphology of the organism is coccus
AND the growth conformation of the organism is clumps|
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The Reasoning Process
Forward reasoning vs. Backward reasoning,
Novice vs. expert reasoning approach
Forward reasoning (data-driven, forward chaining)
Start with all known data and progress naturally to the conclusions
Backward reasoning (goal-driven, backward chaining)
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Production Systems
Production systems are sometimes referred to as productions, rulebased
systems, or inference systems
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Problem solving : “the culmination of intelligent
human activity” (Polya, 1967)
Focusing on heuristics (short cuts, experience, …)