History of Development of Visual Modeling Tools at the Saint Petersburg State University

The accumulated history and experience of using diagram-based software design methods demonstrate that provided with powerful tool support, the use of domain specific visual languages makes possible a conceptually new approach to creation of complex system with a rather low entry threshold for newbies and multiple increase of professionals' performance. For that purpose, software developers must have an extensive set of software tool, from visual editors and repository to debugging, versions control and model refactoring tools.