3. The method of claim 2 , wherein the second determining step is performed by matching the respective word to a tagged word of the data store.
2. The method of claim 1 , wherein: the subject matter categories are of a subject matter category hierarchy that includes a plurality of subject matter categories; and the method further comprises: for each of a plurality of words of a text, determining, in a second determining step and by the at least one computer processor, at least one of the plurality of subject matter categories to which the word belongs; receiving user input of a hierarchy level selection; and for each of at least a subset of the plurality of words, outputting, by the at least one computer processor and based on the user input, an indication of those of the respective at least one subject matter category that are at a hierarchical level at least as high as the selected hierarchy level and to which the respective word has been determined to belong in the second determining step.