I'll take a crack at it. Bruce Gingery and I (and others) went into this
in some detail back when Verizon was doing callouts/callbacks, and I'm
pretty sure that I have still have that discussion archived. It shouldn't
take too long to find those, re-read them, and distill them into something
applicable. Since I'm working on a "worst practices" document anyway,
this would certainly fit.
As a side note, I don't buy into *any* method of "list validation": either
it was built properly or it wasn't. If the former, then nothing needs to
be done; if the latter, then nothing will help: start over.
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