Some years ago I was called to consult with a maker of lighting control systems. They were committed to continuous incremental improvement. There are tools for estimating in process yields described in IPC 9261. And in IPC 7912, end item acceptance. These help make apples to apples comparisons between products with differing levels of complexity, when produced on the same line. The client was not publishing the data, so motivation to stretch the truth was minimized. Their lines were running less than 400 DPMO, with some good work we got it down to 250. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez Sent: Monday, August 24, 2015 8:38 AM To: [log in to unmask] Subject: [TN] PWB, PCB End Of Line Shorts/OPENS detection/Test Fellow TechNetters: In today's world of High Volume Production. What is a good YIELD Rate. Back some 30 years I remember 89 to 92% yield depending on board complexity. Our AOIs weren't as good and accurate as todays. I need some kind of warm and fuzzy number. We used to put external image numbers on all boards to help sort repeat images printing anomalies. What happened to the PERFECT COUPON that was to HELP solve these type of issues. I also see frequent Front to Back cores misregistration!!!!! What's up with that anomaly. Victor, ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________