A computer-implemented method for analyzing electronic documents includes defining at least one search criterion for a plurality of index items relating to a subject; applying the at least one search criterion to a plurality of documents; determining, for each index item in the plurality of index items, a category index reflecting a degree to which the plurality of documents relates to the index item; and generating, with reference to the category index for each index item in the plurality of index items, a performance index reflecting a degree to which the plurality of documents relates to the subject.