Authors: Rainer Burgstaller, Egon Wuchner, Ludger Fiege, Michael Becker, Thomas Fritz

Domain Driven Development (DDD) is one key to conquering the complexity of large-scale software systems. The use of domain-specific models raises the level of abstraction in programming, and helps modularizing and automating the development process. However, in pilot projects using MDx approaches we have experienced the need for more tool support on model level, in particular for monitoring, debugging, and testing. In this paper, we investigate monitoring and feedback mechanisms that make models reflecting the current state of the running system. Additionally, we describe a prototypical implementation, which is a starting point for further work on enabling debugging and testing on model level.