I'm no test pilot but I am a communicator: it can be VERY useful to take a couple of the ground design guys along on a trip and get them to take notes [or video the cockpit work environs] while you run an 'all out' 'everything breaks while 2 are prodding' type sortie and you stand behind commentating the information required and so forth - the designers learning curve can be steep, but when the paradigms shift, it is a wonder to see. This issue is to put the pilots mindset into the engineers head.