1. A computer-implemented system for providing visual suggestions for cluster classification, comprising: a cluster module to obtain one or more clusters comprising uncoded documents from a set, each cluster associated with a visual representation; a designation module to designate a different set of reference documents that are each classified with a code, each code associated with a visual representation different from the representations of the clusters and from the representations of the remaining classification codes; a cluster center module to identify a cluster center in one of the clusters comprising the uncoded documents and to compare the cluster center to one or more of the reference documents; a similarity module to identify those of the reference documents that are similar to the cluster based on the comparison; and a representation module to provide a visual suggestion for assigning one of the classification codes to the cluster comprising the cluster center by displaying the visual representation of the cluster comprising the cluster center together with a list of all of the reference documents similar to the cluster and the visual representations of the classification codes of each of the similar reference documents in the list.