Abstract: The analysis and design of many contemporary large-scale and complex systems such as agent based systems can benefit from an environment which can support componentbased hierarchical modeling. To examine these systems via simulation and in particular in terms of model validation, it is important to use model repositories. This supports designers to systematically study alternative system structures and behaviors. The Scalable System Entity Structure Modeler with Complexity Measures (SESM/CM) offers a basis for modeling modular simulatable and non-simulatable models with complexity metrics. This SESM/CM is extended to allow modelers capture and store some aspects of a system’s behavior. This extended environment allows transformation of models to partial DEVSJAVA models which need to be extended for execution in the DEVSJAVA simulation environment.