Richard,
I agree with Vickie that SPC is SPC. I used the IPC-PC-90 as a guide for
introducing SPC into a factory making helicopter wiring harnesses, blades,
machined parts etc., etc. It was extremely helpful as a guideline.
As to what to control for specific processes, sometime the supplier of the
equipment, fluxes etc. can help. Often they haven't done a DOE so it is
just opinion, however.
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Subject: Re: [TECHNET] Assy: SPC for PCB assembly