2. The method of claim 1 , further comprising: identifying a search expansion, based upon, at least in part, the information gain.
1. A computer-implemented method for refining a search comprising: receiving, using one or more computing devices, a first speech signal corresponding to a first utterance; receiving a second speech signal corresponding to a second utterance, wherein the second utterance is a refinement to the first utterance; determining a first quantity of search results based upon, at least in part, first speech signal information from the first speech signal; determining a second quantity of search results based upon, at least in part, second speech signal information from the second speech signal; comparing at least one of the first quantity of search results and the second quantity of search results with a third quantity of search results; determining an information gain from the comparison; and refining a search based upon at least in part, the information gain.