The Unified Modeling Language is the new official OMG standard for object-oriented modeling languages. This volume contains revised versions of papers presented during the 1st GROOM-workshop on the Unified Modeling Language (UML) which took place at the University of Mannheim, Germany in October 1997. GROOM (Grundlagen objektorientierter Modellierung) is a working group of the Gesellschaft für Informatik (GI), the German Society of Computer Science. The papers are presented in three chapters as follows: UML vs. other approaches - business process modeling and applications - technical aspects and concepts. Researchers and practitioners interested in object-oriented software development, analysis, and design of software systems, and standardization efforts in the field of object technology, and particularly in the main topic of the workshop "Applications, State of the Art, and Evaluation of the Unified Modeling Language" will benefit from this volume.