The Unified Modeling Language has quite rapidly become the dominant language for visually modeling specifications.
We have investigated stereotypes, a concept for user-defined extensions of UML, and have contributed a classification.
We have also analyzed UML with respect to its suitability as a requirements specification language and have identified several problems and weaknesses, some of these being quite severe.
Therefore, we focus our research on non-UML approaches.
Glinz, M. (2000). Problems and Deficiencies of UML as a Requirements Specification Language. Proceedings of the Tenth International Workshop on Software Specification and Design. San Diego. 11-22.
Berner, S., M. Glinz, S. Joos (1999). A Classification of Stereotypes for Object-Oriented Modeling Languages. Proceedings of the Second International Conference on the Unified Modeling Language, Fort Collins. Berlin, etc.: Springer. 249-264.
Joos, S., Berner, S. Glinz, M. (1998). Stereotypen und ihre Verwendung in objektorientierten Modellen - eine Klassifikation [Stereotypes and Their Usage in Object-Oriented Models - A Classification (in German)]. In: K.Pohl, A. Schürr, G. Vossen (eds.): Proceedings of the GI workshop Modellierung'98. TR 6/98-I, University of Münster, Germany. 111-115.