Jim Editorial: You should always track (record and report) rework Obviously the detail required (eg. bridge on U16 pins 2,3) depends on your customer requirements, class 1 doesn't require that much detail whereas for high reliability I believe it is essential. But you have to have it. I have used defect records for: - root cause tracking for field fails (this solder joint failed - has it been reworked already or was it made like this???) - tracking the quality level of a process, quantifying improvements, identification of the need for improvements - measuring shift to shift (1st Vs 2nd Vs 3rd) variation on the same process As they say, if you don't know where you are you have a hard time getting where you need to be... Assuming class 3 (my experience), all defects should be tracked in a database that you can query, with sufficient detail that you can identify common factors and the defect level. I've seen it done as percentage yields, ppm/ofe, %/ofe... Personally I prefer to measure defect rates in parts per million defective / opportunities for error. The key is to have a clear definition of what the number means and how you are going to measure it, and stick to the definition regards, Graham Collins Process Engineer Litton Systems Canada (902) 873-2000 extension 215 . > -----Original Message----- > From: RSIMathis [SMTP:[log in to unmask]] > Sent: Thursday, March 19, 1998 2:09 PM > To: [log in to unmask] > Subject: [TN] PCB assy defect reporting criteria > > My company is unclear as to how we should be recording and reporting > defects > with our PCB assemblies. Some think that all shorts and opens prior > to touch- > up should be reported as defects, others believe we should report only > defects > found after touch-up. > > Questions: > 1.) How do other companies do this? > 2.) Is there an industry standard method for reporting defects? > 3.) Is there an IPC (or other organization's) standard or manual for > reporting procedures? > > Thanks to all, Jim Mathis > > ################################################################ > 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 web site (http://jefry.ipc.org/forum.htm) for > additional information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-9700 ext.311 > ################################################################ ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################