Gogolla, MartinHilken, FrankOberweis, AndreasReussner, Ralf2017-06-212017-06-212016978-3-88579-648-0Modern systems and their architectures are getting more complex than ever. Development strategies, like model-driven engineering (MDE), help to abstract architectures and provide a promising way to deal with the complexity. Thus, the importance for the underlying models to be correct arises. Today's validation and verification tools should support the developer in generating test cases and provide good concepts for fault detection. In this contribution, we introduce and structure essential use cases for model exploration, validation and verification that help developers find faults in model descriptions. Along with the use cases, we demonstrate the model validator of the USE tool, a modern instance finder for UML and OCL models based on an implementation of relational logic and present the results and findings from the tool.enText/Conference Paper1617-5468