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What is a truth maintenance system?

  • A.A mechanism ensuring the knowledge base remains consistent
  • B.A record of when each fact was added to the knowledge base
  • C.A component recording justifications so conclusions can be retracted
  • D.A system that verifies the truth of the facts against a database

Answer: C

A TMS stores why each conclusion was drawn, so when a premise is withdrawn the conclusions depending on it can be retracted efficiently rather than by rebuilding everything from scratch. It is the practical machinery that makes non-monotonic reasoning affordable. Verification, consistency enforcement and timestamps are related but different. Recording the derivation as well as the result is what allows a system to change its mind without starting again.

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