FAB: Vendor Verification? Validation?

I am having to address this question:
"If you switch bare board manufacturers, what should you
do to verify that the new boards are just as good or better
than the old ones were?"

I can say a lot about how to CHOOSE a bare board vendor
and how to SPECIFY minimum levels of acceptability, but
from a technical point of view, is there more that should be
done than typical visual inspection, dimensional checks and
cross sections of the boards themselves?

Do any of you periodically monitor your bare board vendor
by asking for process control reports and stuff like that?

Have any of you ever been asked to re-validate a product
(reliability testing) on products just for changing the bare
board vendor?

Maybe I have just had a fortunate career by always getting
good boards, but lately I've been stung a few times in this
brave new world.

have a good day,
Jack

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