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You are correct, I misspoke, the zones themselves don't need to be exactly parallel.

Sorry, "A)" and "B)" this way is actually more accurate, since datum A will be determined by the surfaces high points: Yes, the tolerance zones are necessarily parallel. Flatness is determined by the peak to peak (surface high point to surface low point) variation in the surface, those high...

Thanks for all of the replies, this is really helpful. So, as far as I can understand, all of these scenarios are possible given this method: Is this assessment correct?

I am looking for some help with the following situation (see image). I've been looking through ASME Y14.5-2009 and other guides and can't find precisely what I'm looking for. I'm trying to determine how the note, "Perfect form not required at MMC" effects this tolerance scheme. I'm primarily...