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The Unified Modeling Language (UML) is a widely used general purpose modelinglanguage. Together with the Object Constraint Language (OCL), formal models canbe described by defining the structure and behavior with UML and additional OCLconstraints. In the development process for formal models, it is important tomake sure that these models are (a) correct, i.e. consistent and complete, and(b) testable in the sense that the developer is able to interactively checkmodel properties. The USE tool (UML-based Specification Environment) allowsboth characteristics to be studied. We demonstrate how the tool supportsmodelers to analyze, validate and verify UML and OCL models via the use ofseveral graphical means that assist the modeler in interpreting and visualizingformal model descriptions. In particular, we discuss how the so-called USEmodel validator plugin is integrated into the USE environment in order to allownon domain experts to use it and construct object models that help to verifyproperties like model consistency.

User Assistance Characteristics of the USE Model Checking Tool