1. A method of processing defect data indicative of defects in a product, comprising: assigning each of the defects one of a plurality of severity levels; assigning each of the defects one of a plurality of impact levels; classifying the defects into categories based on combinations of severity level and impact level; automatically generating a graphic representative of a topographical relation among numbers of defects in the categories; and displaying the graphic on a graphical user interface (GUI).