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What is the Sussman anomaly?

  • A.A domain in which the planner runs indefinitely without terminating
  • B.A blocks problem where achieving goals separately fails
  • C.A planning problem with no solution although one appears likely
  • D.An error in an early planning algorithm's implementation

Answer: B

The anomaly shows a goal conjunction whose parts cannot be achieved one after another without undoing the first, which defeated planners that assumed goal independence. It motivated interleaved planning and partial order approaches. Insolubility, bugs and non-termination are different phenomena. A small counterexample that refutes an assumption an entire generation of algorithms rested on is worth remembering for what it demonstrates rather than for the puzzle itself.

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