I agree wholeheartedly with Werner's statement and
          conclusion that the possible gain in reliability is not
          worth the loss in manufacturability.  In some cases, if the
          non-functional pads are required to be left on, drill stack
          height is reduced and this impacts board cost.  The round
          robin study is also quite outdated (I believe the late
          '80's), and was done at a time when small hole drilling was
          new to everyone.  There have been several process
          enhancements since then.  Hmmmmm....maybe it's time to do a
          new study?!?
          Tom Coyle
          Field Services Engineer
          HADCO Corporation

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