Abstract: A method for expanding a hierarchical taxonomy associated with a corpus of documents may include performing cluster analysis on documents associated with a leaf node of the taxonomy to determine a plurality of first clusters, each cluster of the plurality of first clusters being associated with one or more documents associated with the leaf node; determining one or more topics associated with the documents in each cluster of the plurality of first clusters; performing cluster analysis on the topics to determine a plurality of second clusters, each cluster of the plurality of second clusters being associated with one or more of the topics; determining a name for each cluster of the plurality of second clusters; and expanding the hierarchical taxonomy based on the topics associated with the documents in each cluster of the plurality of first clusters and the determined name for each cluster of the plurality of second clusters.

Abstract: A method includes receiving, at a computing device, an electronic document, wherein the electronic document is a legal brief comprising a plurality of paragraphs; identifying one or more argument paragraphs from among the plurality of paragraphs, wherein each of the one or more argument paragraphs includes one or more legal arguments; performing a textual search of a corpus of legal documents based on a selected set of the identified argument paragraphs; performing a semantic search of the corpus of legal documents based on the selected set of the identified argument paragraphs; combining results of the textual search and the semantic search; and presenting the combined results to a user.