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The most successful of the hand-coded planners in 2000, TALPLANNER [Kvarnström MagnussonKvarnström Magnusson2003] uses a temporal action logic as a language for describing planning domains and uses control rules that guide the planner in making intelligent choices while constructing plans in a forward search -- an idea originally developed in TLPLAN. The rules can act to prune away search branches that are predicted (by the human encoding the rules) to lead to no solutions. Using this idea, it is possible to arrive at a collection of rules that, by examination of a given state, can guide the planner to choose actions so effectively that virtually no search is required at all.

Derek Long 2003-11-06