1. A method comprising, with at least one computing device: obtaining one or more electrical signals representing a plurality of documents partitioned into a plurality of clusters; for each of a selected subset of said clusters, generating one or more electrical signals representing a subset cluster similarity value based, at least in part, on: one or more electrical signals representing structural features associated with each cluster in said subset of said clusters, and one or more electrical signals representing static content features associated with each cluster in said subset of said clusters; and selectively merging at least one said subset of said clusters to form a super cluster based, at least in part, on said one or more electrical signals representing subset cluster similarity value and one or more electrical signals representing at least one desired consistency threshold value.