Toru San, the following may be helpful: 1. Quality Assessment of Printed circuit Boards by Preben Lund Publisher Bishop Graphics 5388 Sterling Center Drive P.O. Box 5007 Westlake Village, Califonia, 91359-5007 2. Printed circuit Technology by Norman S. Einarson Printed Circuit Technology P.O. Box 334 Burlington, MA 01803 Tel (617) 272-0938 Hope this helps *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************