Collection of inventory data for a pavement management system requires searching for data from several sources. Often, locations of these sources are not commonly known. Many times, officials of Goverment bureaus or district agencies do not even realize that they have certain pieces of information in their own files. Thorough procedures were used in the Illionis Department of Transportation, Bureau of Materials and Physical Research, to obtain original construction and rehabilitation design information for the Department's pavement management system.