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 storing the linked individual normalized issues in a non-transitory computer-readable medium.