The Present Problems and Roadmap of UML

Since OMG adopted UML as its standard modeling language in 1997, UML has got universal attention in computer science and engineering, and found wide application It has become a de facto standard But at the same time, UML suffers criticism from users, vendors, scholars, and teachers with different point of views OMG has issued three revisions （1 3, 1 4 and 2 0） of UML, and different people put up different opinions on UML with emphasis on simplifying, defining kernel, extending mechanism and formal semantics, etc