The United States National Standard ANSI/ASQC Z1.4(1981) is a revised version of the military attributes sampling system MIL-STD-105D. This standard has undergone revisions to modernize terminology and to emphasize the system aspect of the procedure. In addition, it has been made even more compatible with its variables counterpart ANSI/ASQC Z1.9(1980), which was derived from MIL-STD-414. The development and nature of these revisions are described.