Most of the articles in this volume are revised versions of papers presented during the 1st GROOM-Workshop on the Unified Modeling Language (UML). GROOM (Grundlagen objektorientierter Modellierung) is a working group of the Gesellschaft fur Informatik (GI), the German Society of Computer Science. The workshop took place at the University of Mannheim (Germany) in October 1997; the local organizers were Martin Schader and Axel Korthaus, Department of Information Systems. The scientific program of the workshop included 21 talks, presented in German language on Friday, Oct. 10th, and Saturday, Oct. 11th, 1997. Researchers and practitioners interested in object-oriented software development, analysis and design of software systems, 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" had the opportunity to discuss recent developments and to establish cooperation in these fields. The workshop owed much to its sponsors and supporters - University of Mannheim - Faculty of Business Administration, University of Mannheim - Sun Microsystems GmbH - Apcon Professional Concepts GmbH. Their generous support is gratefully acknowledged. In the present proceedings volume, papers are presented in three chapters as follows.

1: UML vs. Other Approaches.- Exchange of UML-Models with EIA/CDIF.- Object-Oriented Modeling Languages: State of the Art and Open Research Questions.- From a Semantically Irreducible Formulated Conceptual Schema to an UML Model.- On Mapping Between UML and Entity-Relationship Model.- Evaluation of Object-Oriented Modelling Languages: A Comparison Between OML and UML.- 2: Technical Aspects and Concepts.- A Critical Look upon UML 1.0.- Systems, Views and Models of UML.- On Constraints and Queries in UML.- Modeling Java Threads in UML.- Formal Definition of UML's Package Concept.- UMLscript: A Programming Language for Object-Oriented Design.- Ways of Handling and Interpreting Specialization in Object-Oriented Modeling.- Reuse of Models and Diagrams of the UML and Implementation Concepts Regarding Dynamic Modeling.- 3: Business Process Modeling and Applications.- Application of UML Within the Scope of New Telecommunication Architectures.- Using UML for Business Object Based Systems Modeling.- System Development with V-Model and UML.- Business Process Modeling with EPC and UML: Transformation or Integration?.- Conventions for the Practical Use of UML.- Software Engineering Process with the UML.- Author and Subject Index.