Discussion
What is the difficulty with forward search in planning?
Answer: B
In a realistic domain hundreds of actions apply in every state and almost none advances the goal, so unguided forward search is hopeless. Good heuristics derived from relaxed problems changed that entirely and made forward search competitive again. The initial state is complete by assumption, actions are applicable regardless of the goal, and state spaces are enormous. A method dismissed as hopeless and revived by better heuristics is a reminder that a search strategy is only as good as its guidance.
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