We are going to be numbering all of our equipment in the plant in order to implement a computer aided maintenance system. We have already tried a couple of approaches to this: numbering by line designation, numbering by physical zone location, but each system seems to reveal problems after being used for some time. Usually this occurs when the zone delimitations are changed (walls being moved, etc.) or when equipment is moved to a new location. I would welcome any thoughts on this issue or any recommended reading in order to re-plan this task for the LAST time. Thanks Gerald Beaudoin Leahy Ochards Inc.