Re: What could go wrong?
And that was the key problem: there were big management bonuses tied to on-time delivery. People are people. They were determined to deem the system delivered on time and get their bonuses no matter what, and they did (and they got to keep them!). Somebody forgot to specify that what they delivered should work.
You can't imagine the nightmare this has caused for employees incorrectly paid. Some have gone without pay for months and are in danger of losing their homes due to defaulted mortgage payments. Others have been overpaid, taxed incorrectly as a result, and are now trying to fix that error, which will result in more fixes next year, and fixes to the fixes the year after that etc. etc.