+Armin Grewe, amongst a lot of other things, I design UIs for industrial systems.I did know red=problem, I did not know people felt compelled into fixing the problem to make the red go away – which means red is a good colour to show problems only to people who can rectify the problem in the first place.The other thing I did not know is the 3 dots as a way to flag something is about to happen – again compelling people into doing something but not walking away immediately and coming later but staying and acting immediately.