The main goal of this thesis is tackling the domain of interactive systems and applying a DSML-based workflow which leads from a system specification to the prototyping of a Graphical User Interface. We chose to use the domain of Control Systems as an example of application for several reasons. Among others, it needs modularity, interactivity, property validation; it requires the development of a user interface; and the domain experts are not typically expert software engineers. The outcome of the thesis is the definition of a methodology that allows easy prototyping of a GUI for interactive systems. The take-away lesson is giving readers a concrete working example of how to build a similar methodology for their domain.