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Which reasoning does a truth maintenance system support?

  • A.Retracting conclusions when their support is withdrawn
  • B.Combining evidence from several independent sources into one overall degree of confidence
  • C.Ordering the rules for firing
  • D.Choosing which question to ask the user next in order to narrow the diagnosis quickly

Answer: A

A truth maintenance system records the justification for each belief so that withdrawing a premise automatically withdraws whatever depended on it. That makes non-monotonic reasoning practical and avoids rebuilding every conclusion from scratch. Evidence combination, conflict resolution and question selection are separate mechanisms. The dependency record also supports explanation, since it is exactly the derivation of a belief. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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