8. A non-transitory computer readable memory medium, including computer executable instructions for adjusting a call center application operable to associate a user utterance with an action-object based on a salient term in the user utterance, the instructions including instructions executable to: determine that at least one of a match rate for associating user utterances with the action-object and a performance rate for the associating user utterances with the action-object is below a corresponding threshold; and responsive to executing the instructions to determine, modify salient terms associated with the action-object; wherein the instructions executable to modify comprise instructions executable to remove an association of the salient term with the action-object based on a frequency with which the salient term occurs in a selected set of user utterances, and wherein a size of a set of salient terms matching the action-object is maintained near an optimum value with regard to the match rate and the performance rate.
8. A non-transitory computer readable memory medium, including computer executable instructions for adjusting a call center application operable to associate a user utterance with an action-object based on a salient term in the user utterance, the instructions including instructions executable to: determine that at least one of a match rate for associating user utterances with the action-object and a performance rate for the associating user utterances with the action-object is below a corresponding threshold; and responsive to executing the instructions to determine, modify salient terms associated with the action-object; wherein the instructions executable to modify comprise instructions executable to remove an association of the salient term with the action-object based on a frequency with which the salient term occurs in a selected set of user utterances, and wherein a size of a set of salient terms matching the action-object is maintained near an optimum value with regard to the match rate and the performance rate. 11. The memory medium of claim 8 , wherein the instructions executable to remove comprise instructions executable to remove the association of the salient term based on a word count indicative of the frequency.