10. A method for providing visual suggestions for document classification via injection, comprising: obtaining clusters of unclassified documents; obtaining a set of reference documents, each reference document associated with a classification code; comparing one or more of the unclassified documents within one such cluster to the reference documents; identifying for the cluster, one or more of the reference documents that are similar to the compared unclassified documents; injecting the similar reference documents into the cluster; setting a threshold for a number of the similar reference documents to be injected into the cluster; displaying each of the similar reference documents in the cluster with a visual indicator representative of the associated classification code and further displaying the unclassified documents of the cluster; and providing a suggestion for classification for one of the unclassified documents within each cluster based on the visual indicators of the similar reference documents.
14. The method according to claim 10 , further comprising: selecting the set of reference documents from a prior document review project.