A 72 year old human interface, user interface and user experience discussion. You can see quite a bit of the recommendations in aircraft produce within a decade

A 72 year old human interface, user interface and user experience discussion. You can see quite a bit of the recommendations in aircraft produce within a decade after this report. The typical single engine airplane from Piper or Cessna, made use of a common push-pull control for throttle, mixture, propeller pitch, and carb heat, but they all have different shaped knobs on them; and later versions also had different colors. The up/down toggle switch for flaps and gear also have different shapes: flat handle for flaps, and a wheeled handle for gear. And so on.