How is the work in VR different from work in UML-based tools?
VR is a tool for organizing text that describes a product under construction. VR has a very small number of simple base concepts, which makes it easy to learn and start using. UML is a general purpose modeling language for building analysis and design models of software systems; it contains a large number of concepts and tools to represent various aspects of software systems at very detailed level. At the same time, UML does not cover all the needs of working with requirements, which is proved by the mere existence of requirements management tools for many years.
