The funny thing is it's not just "NASA way back when". Even now, the most critical code (e.g. implantable heart defibrillators) likely has less "unit test" tha

The funny thing is it's not just "NASA way back when". Even now, the most critical code (e.g. implantable heart defibrillators) likely has less "unit test" than advert code that posts junk to your facebook wall. Waterfall is still the more sensible approach in some industries.