The "model we are assembling" since the crash matches to your comment.
only test pilots, or rare individuals, can keep a clear head and systematically fault find.
I personally had few incidents where this was observed. I started the observations 50 years ago and with maturity, experience and training (to develop methods) the "clear head and systematically fault find" was possible. And worked (and works) very well. In different types of machines sometimes in extreme and dangerous situations. Problem is when "things happens fast" Your chances dim very fast if initial solutions not the best. Fortunately i always had chances. Invariably staying "ahead". Even "ahead" i faced a surprise testing a car 19 years ago. (At night, light rain, concerned with a family member disease and a subtle hidden fault in a tire, aggravated by a
little error
).