What did the Sussman Anomaly demonstrate? There are planning problems for which the shortest solution can not be found by a standard planner. Most planning problems are solvable in the same general time frame. The Sussman Anomaly demonstrated a problem that took unusually long. For certain planning problems, the result returned by a planner can not be a valid solution. Splitting a complex goals into subgoals and solving these subgoals independently in sequence does not always work