24. A method as described in claim 19 , wherein the user interface is configured to associate the particular semantic graph to at least one said topic of a corresponding said semantic cluster.
19. A method implemented by one or more computer processors, the method comprising: receiving an input that specifies a particular semantic graph of user utterances that is based on a linguistic analysis; processing a corpus that is a historical log of user utterances, the processing performed using the specified semantic graph of user utterances and one or more other semantic graphs of user utterances that are part of semantic clusters that are formed for like topics; and outputting a result of the processing in a user interface.