Abstract: A computer-implemented method for comparing the contents of two sets of documents includes the step of extracting from a set of documents ?44! corresponding sets of document extract entries ?46!. The method further includes a step of generating from the sets of document extract entries ?46! corresponding sets of word clusters ?48!. Each word cluster comprises a cluster word list having N words, an N.times.N total distance matrix, and an N.times.N number of connections matrix. The preferred embodiment includes a step of grouping similar word clusters and combining the similar word clusters to form a single word cluster for each group. The grouping comprises evaluating a measure of cluster similarity between two word clusters, and placing them in a common group of similar word clusters if the measure of similarity exceeds a predetermined value. The step of evaluating cluster similarity comprises intersecting clusters to form subclusters and calculating a function of the subclusters.