1. A computer-implemented method of generating an issue network from a document corpus, the method comprising: searching, using a computer, the document corpus for a set of documents discussing a starting issue, wherein the starting issue is one of a plurality of normalized issues defined by the document corpus; determining a set of normalized issues discussed by the set of documents discussing the starting issue, wherein the set of normalized issues also includes the starting issue; determining instances of co-occurrences of individual normalized issues of the set of normalized issues within individual cases of the set of documents; linking individual normalized issues of the set of normalized issues based on their co-occurrences within the set of documents, wherein the linked individual normalized issues at least in part define the issue network; and providing for display a graphical representation of the issue network on a display device, wherein the graphical representation of the issue network comprises nodes representing individual normalized issues of the set of normalized issues, and edges linking the nodes based on the co-occurrences of the individual normalized issues within individual documents within the set of documents.