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What does an action schema specify?

  • A.The probability distribution over the action's outcomes
  • B.The cost of performing the action in a particular state
  • C.Preconditions and effects with variables to be instantiated
  • D.The exact sequence of steps that the action performs internally

Answer: C

A schema such as move with parameters states what must hold for it to apply and what becomes true and false afterwards, and grounding it gives the individual actions. Internal steps are below the level of the model, probabilities belong to probabilistic planning and costs are an optional addition. Describing a family of actions by one parameterised schema is what keeps a domain description short enough to write by hand.

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