3. The method of claim 2 , further comprising: establishing a configurable percolation algorithm, said percolation algorithm defining a manner in which confidence scores associated with child nodes of a parse-tree are applied to parent nodes of the parse-tree, wherein leaf nodes of the parse-tree are words, each associated with one of the word-level confidence scores.
2. The method of claim 1 , wherein the ascertaining step is based on word-level confidence scores.