1. A method of putting items into categories, which comprises: (a) dividing said items into a plurality of groups; (b) performing a first ranking of the items in each group, such that each item has a set of befores and a set of afters; (c) selecting at least one set of items for a subsequent ranking; (d) performing said subsequent ranking of the items of said at least one set of items; (e) cascading the befores and afters of the items of said at least one set of items according to said subsequent ranking; (f) determining which of said items are categorized; (g) removing categorized items from consideration; and, (h) repeating steps (c) through (g) until all items have been categorized.