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Why are irreversible actions difficult for a planner?

  • A.A wrong choice may make the goal permanently unreachable
  • B.Irreversible actions cannot be represented in the formalism
  • C.The planner cannot compute a heuristic for such actions
  • D.Every irreversible action creates a dead end immediately

Answer: A

In a reversible domain any mistake can be undone, so greedy search recovers, whereas an irreversible action may commit the agent to a state with no plan. Breaking a fragile object is the standard example. Representation and heuristics are unaffected, and irreversibility does not in itself create a dead end. Asking whether mistakes are recoverable, before choosing a search strategy, determines how cautious that strategy must be.

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