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Why does classical planning adopt the closed world assumption?

  • A.It makes the goal test faster to evaluate
  • B.Only the true atoms need be listed in each state
  • C.It guarantees that every planning problem has a solution
  • D.It allows actions to have uncertain effects

Answer: B

Listing only what is true keeps a state description short, since the alternative would be to record the truth or falsity of every atom. It is appropriate because a planner's model of the world is complete by construction. Solvability, uncertainty and goal testing are unaffected. An assumption adopted because the domain genuinely satisfies it, rather than for convenience, is the legitimate use of the closed world reading.

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