12. The method of claim 1 further comprising: by machine, generating a set of agent type classifiers for one or more clusters in the first set of clusters.
12. The method of claim 1 further comprising: by machine, generating a set of agent type classifiers for one or more clusters in the first set of clusters. 15. The method of claim 12 wherein grouping responsive communications of members of the second party type into a second set of clusters based upon the grouping of the communications of members of the first party type comprises: using the first agent type classifiers to classify a communication of a member of the first party type into a cluster of the first party type; grouping a communication of a member of the second party type that is subsequent to the classified communication of the member of the first party type into a cluster of the second party type that relates to the cluster of the first party type.