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Which structure does a justification-based truth maintenance system store?

  • A.A queue of the beliefs waiting to be either confirmed or withdrawn by the inference engine
  • B.A dependency network of beliefs and their supports
  • C.A complete list of every assumption set under which each belief in the system would hold
  • D.A probability for each belief

Answer: B

A JTMS links each belief to the beliefs justifying it, so retraction propagates along the network. The alternative ATMS instead labels each belief with the assumption sets supporting it, which allows several contexts to be explored at once at greater cost. Probabilities and work queues are not what either records. The contrast between the two designs is the usual examination question here. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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