15. The system of claim 9 wherein the user interface module is further configured to allow a second user to review the first concept category assigned to the file, and to receive a selection of a second concept category from the second user.
15. The system of claim 9 wherein the user interface module is further configured to allow a second user to review the first concept category assigned to the file, and to receive a selection of a second concept category from the second user. 16. The system of claim 15 wherein the classification module is further configured to assign tag information corresponding to the second concept category to the file.