And I'm afraid you're still not telling me what UML is, only what it's for, which is subtly different. You're keen to tell me what it's intended to make better about my life, but you haven't really described what it is, and how it achieves what it aims to achieve. There can be a world of difference between things which have the same aim: for example, a vacuum cleaner, a carpet shampoo and a mop all share the aim of making floors cleaner, but they are totally different things which go about the job in different ways.