Discussion
What is the advantage of regression over progression?
Answer: D
Working from the goal means an action is considered only if it achieves something wanted, which prunes the irrelevant actions that swamp forward search. The price is that the descriptions manipulated are partial and consistency checking is harder. Branching depends on the domain and heuristics remain essential. Restricting attention by relevance rather than by applicability is the structural difference between the two directions. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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