I finally received copies of IPC-6011/6012 and don't understand the furor over the new specifications. Admittedly a single reading is not sufficient to make one an expert on a specification, but I found several sections of the new specification refreshing. Moving some information to 6011 makes 6012 easier to use for an acceptability/performance specification. The changes to the specification limits seem to reflect current capabilities and practices. Clarifications to line and spacing width and roughness have resulted in improvements to these criteria. (I can understand them and explain them to others now.) The most important addition to the specification is the inclusion of default criteria. Many board users are fond of referencing IPC specifications without understanding (reading? - sorry my opinion slipped out) them first. The inclusion of the default criteria will help validate fabricator recommendations for specification criteria. Sorry about the lag between this post and the other postings on this subject. Don Vischulis [log in to unmask]