11. A system for displaying relationships between concepts to provide classification suggestions via injection, comprising: reference concepts each associated with one of a plurality of classification codes, wherein each concept comprises nouns and noun phrases with common semantic meaning that are extracted from a set of documents; and a processor configured to designate clusters of uncoded concepts, to compare one or more of the uncoded concepts from at least one cluster of the uncoded concepts to the coded reference concepts in the set, to identify at least one of the coded reference concepts that is similar to the one or more uncoded concepts in the at least one cluster, to inject the similar coded reference concepts into the at least one cluster of the uncoded concepts, to provide a classification suggestion for one or more of the uncoded concepts based on a presence of one or more different classification codes of the coded reference concepts and an absence of one or more of the different classification codes of the coded reference concept, to display each of the uncoded concepts and the coded reference concepts in the at least one cluster via a representation, to display each suggestion within the representation for that uncoded concept, and to receive from a human reviewer a classification code for at least one of the uncoded concepts associated with the classification suggestion, wherein the received classification code is one of the same as or different than the classification suggestion.
13. A system according to claim 11 , wherein the processor is further configured to determine a center of the at least one cluster based on the one or more uncoded concepts, to compare the cluster center with the coded reference concepts, to select a sample comprising the one or more uncoded concepts, to compare the sample with the coded reference concepts, wherein the sample can be selected via at least one of manually and automatically, and to compare the cluster center and the sample for the at least one cluster with the coded reference concepts.