Most people think that anything 99.9% is good enough and is as close enough to perfect. Well here are some real world examples of what would happen if 99.9% is good enough:
315 entries in Webster's Third New International Dictionary of English Language will be misspelled.
291 pacemaker operations will be performed incorrectly this year.
Two plane landings daily at O'Hare International Airport will be unsafe.
22,000 checks will be deducted from the wrong bank accounts in the next 60 minutes.
So next time management tells you that something is "Good Enough" you can show them this list.