Our part numbering system is similar to a lot that has been said already. Simply, XXX-XXXX-XX are all numbers with the first three the class, the next four some unique identifier (usually just the next available number), and the last two the revision number. From a traceability and control perspective, the revision number has been very effective, especially for subcomponent or design changes. Disadvantage, you still need a cross reference guide and multiple part numbers of the same component can be created. No controls to stop that, just an awareness by the designer to check first. We've also incorporated all this information into a searchable database. Controlled, of course, but with approved vendors and other information. Glenn ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################