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; a designation module to designate a different set of reference documents that are each classified with a code; a cluster center module to identify a cluster center in one of the clusters 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 visually represent the classification codes of each of the similar reference documents as a suggestion for assigning one of the classification codes to the cluster.