ME2 validation: what does the QA process look like?

The Mass Effect 2 Playstation 3 Technical Support forum seems to be the most appropriate forum to ask the question, so could someone at Bioware please confirm what the QA process for ME2 PE3 'looked like'? I’ve never been lucky enough to work in the gaming industry and, following recent revelations about the ‘buggy’ nature of this latest instalment of the game, I find myself genuinely curious as to what this process involved. Not expecting full disclosure or anything but a top line would be very much appreciated.