Brian asks: "Does anyone know of any studies on this subject? " I think you'll find that if you contact 3M, they can come deliver a very effective presentation tailored to whatever audience is appropriate (technical staff, bean counters, etc..). While they're clearly in the business of selling this stuff, they still have a very effective set of presentations to deliver. Rgds John John Brewer Component Engineering Supervisor Square D Company [log in to unmask] ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################