I concur with Denny Fritz. The IPC PCQR2 committee has designed a series of "Test Vehicles " (TV) that are 18" X 24" and comes in 6 MLB versions: - 6 layer (.031" or .062" thick ), - 12 layer ( .062"thick ), - 18 layer ( .093" thick ) - 24 layer (.125" or .250" thick ) Each TV is compromised of 352 modules (1.0 inch square each). Each module is designed to asses a specific quality attribute and process capability. Data (electrical test data) is collected from a test batch of 30 TV boards processed simultaneously. The data is evaluated thru a proprietary software and the process capability is assessed. The information is then stored in a data base for reference. Best Regards George Milad Chairman IPC Plating Committee