So here's a small example of what we're doing and where our time is going. As we chip away on the last part of the FMS, that is the descent phase of the VNAV, we try and capture every scenario and represent it, but then when you begin flight testing as we are now, some sneak by you....like this one that took me half a day to find and fix because I noticed speed and altitude values for this cheeky little waypoint (DF644) didn't match up with common sense...so I knew I was on a bug hunt.