21. The method of claim 1 , wherein the graphic further comprises both the measure of relationship overlap between the first document and the second document and the measure of relationship overlap between the first document and a selected portion of the second document.
22. The method of claim 21 , wherein the graphic further comprises: a measure of a size of the first document, a measure of a size of the second document; and a measure of textual overlap between the first document and the second document.