1. A computer-implemented system for identifying relevant documents for display, comprising: themes for a set of documents; an extraction module to extract noun phrases from the documents as concepts; a theme generator to group two or more of the concepts as one such theme; a frequency table that identifies each of the concepts and a frequency of occurrence of each concept within each of the documents in the set; a graph generator to generate a graph of the concepts, comprising: an x-axis of the graph defining the concepts; a y-axis of the graph defining a number of the documents that reference each concept; and a mapping module to map the concepts on the graph in order of descending number of referring documents; a cluster module to cluster the documents based on the themes; a matrix for the documents comprising an inner product of document frequency occurrences and cluster concept weightings for each theme; an identification module to identify from the matrix, documents most relevant to a particular theme; and a display to present the relevant documents.