The Unified Modeling Language consists of a set of graphical description techniques for the specification and documentation of object- oriented systems. We describe the experiences gained while using UML 1.0 for the development of a small, distributed Java program for planning break supervision schedules in schools. Our motivation in this case study is not only to evaluate the techniques provided by UML and Java, but also to study their interrelationships and their methodical use from requirements analysis to implementation. Based on the observations some proposals for extensions and changes to the UML are made. Because the example is complete and self-contained and provides methodical guidelines and hints, it can also be used as a tutorial for UML 1.0 and for object-oriented development in general.
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