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What is a hierarchical task network?

  • A.A network of planners each handling part of the problem
  • B.A hierarchy of goals ordered by their importance
  • C.A decomposition of the state space into abstract regions
  • D.A planner decomposing abstract tasks into smaller ones

Answer: D

An HTN planner begins with high level tasks and applies methods that decompose them into subtasks until primitive actions remain, which encodes human knowledge of how things are usually done. It scales to large practical problems at the cost of requiring that knowledge. Distributed planning, goal priorities and state abstraction are different ideas. Supplying procedural knowledge to a planner, rather than expecting it to be discovered, is what makes industrial planning feasible.

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