I don't and if you're religious about it, I'm afraid I don't want to work with you (I accept the feeling may be mutual)! Most developers don't have a complete

I don't and if you're religious about it, I'm afraid I don't want to work with you (I accept the feeling may be mutual)! Most developers don't have a complete knowledge of it and don't enjoy writing it; essentially I believe it's because they know it's not an efficient way of communicating ideas with other developers. Modelling can be useful, but as far as I can work out something like gliffy with lines, boxes and little else is almost always sufficient. I'd imagine safety critical space or aviation systems and other niches are a different kettle of fish.