Discussion
What is goal interaction in planning?
Answer: D
Interactions may be positive, where one action serves several goals, or negative, where achieving one undoes another, and both defeat a planner that treats goals independently. Mutual exclusion is the extreme negative case. Precedence and listing order are different notions. Recognising that both kinds of interaction exist explains why the additive heuristic overestimates and why the Sussman anomaly is hard, in one idea rather than two. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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