Tom - When IPC-2221 was developed, the intent was to give the widest possible lattitude to the acceptability of conformance test coupons, realizing that many of us had extensive libraries of perfectly good coupons which had been developed under MIL-STD-275, IPC-D-275 and others. This produced the last sentence of Para. 12.4: "Variations in specified coupon design must meet the intent of the original design and be representative of the board." We have just undergone a library update, a result of having gone to a new CAD package. The system software predates IPC-2221 and has some minor variances in the coupons it generates. Once we determined that these have no bearing on the actual performance of testing (IPC-6012 and/or MIL-PRF-31032), we simply documented the variances and the rationale for their acceptability and got on with life. Interestingly, while working on this task internally and with a number of our board suppliers, I learned that most of the board suppliers would actually prefer to generate and place the necessary conformance test and process control coupons themselves. Regards - Kelly ################################################################ 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 ################################################################