Probably 10 years ago our boards were predominately HASL leveled tin/lead.
We performed a Taguchi experiment with one of our suppliers and were able to
optimize the process so the thickness/height and the shape of the height.
We were able to optimize the controls and establish a spec.  Most all our
boards now are Ni/Au for SMT.  We also found that by performing the Taguchi
we were able to do all this in probably 4-6 weeks.  Most of that time was
planning, travel, and confirmation.  Our supplier worked with us on the
project and the result was a win-win for everyone involved, ITT, the
supplier, and the ultimately the customer.  A well planned Taguchi or DOE
would allow you to optimize your process in a timely manner.

Ron Hollandsworth
ITT

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