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Which advantage does a decision table have over an equivalent rule set?

  • A.It allows the conditions to be evaluated in any order the inference engine happens to choose
  • B.Completeness is easy to check
  • C.It can express relations between objects that a set of production rules would be unable to state
  • D.It executes faster

Answer: B

Every combination of conditions appears as a column, so a gap or a contradiction is immediately visible, whereas the same defect hides easily in a list of rules. Expressive power is lower rather than higher, speed is comparable and evaluation order is not the point. Tables are therefore often used as the authoring medium and compiled into rules for execution.

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