1. A computer implemented method for adjusting a call center application operable to associate user utterances with action-objects based on existing sets of salient terms, the method for adjusting comprising: automatically adding, by the computer, a new salient term to an existing set of salient terms associated with an action-object when a percentage of user utterances failing to associate with the action-object, based upon the existing set of salient terms, exceeds a specified threshold; and automatically removing, by the computer, a current association of a salient term with the action-object from the existing set of salient terms when a percentage of user utterances associating with the action-object, based upon the existing set of salient terms, exceeds a specified threshold, wherein a size of the existing set of salient terms is maintained near an optimum value with regard to a match rate and a performance rate of the call center application.