Rich I would think that the rigid board specification 6012 would be able to answer your questions. Some coupons are used for qualification testing others for quality conformance tests (group A) and others for monthly testing. 6012 has table that tell you what tests are performed on what coupons. There are still others that are used for "in process" tests. This set of coupons would not be in 6012 and If you have questions about them we can discuss later. Susan Mansilla Robisan Lab 317-353-6249 ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################