Several new technologies may provide solutions to this problem. Document management software can index all of a projects files and documents by type, author, date, or location. Document viewing programs recognize and display various word processing file formats and can search for specific words or phrases in a set of electronic documents. Similar programs display drawings generated by computer aided drafting systems, and allow reviewers to mark up drawings without actually changing CAD files. Imaging systems scan paper documents optically, producing an electronically recorded image which can be indexed, retrieved and viewed. By using a combination of these technologies, it may be possible to create and maintain a single, integrated project file electronically. The file would be complete, current, authoritative, and accessible to the Departments technical staff in the central office and field offices. It could also support an Executive Information System for management. But at present, the Department has not specifically identified how a combination of appropriate technologies can be most effectively used for this application.