ESL or Electronic System Level is a buzz word these days in the electronic design automation (EDA) industry in design houses and in the academia. Even though numerous trade magazine articles have been written quite a few books have been published that have attempted to de?ne ESL it is still not clear what exactly it entails. However what seems clear to every one is that the Register Transfer Level (RTL) languages are not adequate any more to be the design entry point for today s and tomorrow s complex electronic system design. There are multiple reasons for such thoughts. First the c- tinued progression of the miniaturization of the silicon technology has led to the ability of putting almost a billion transistors on a single chip. Second applications are becoming more and more complex and integrated with c- munication control ubiquitous and pervasive computing and hence the need for ever faster ever more reliable and more robust electronic systems is pu- ing designers towards a productivity demand that is not sustainable without a fundamental change in the design methodologies. Also the hardware and software functionalities are getting interchangeable and ability to model and design both in the same manner is gaining importance. Given this context we assume that any methodology that allows us to model an entire electronic system from a system perspective rather than just hardware with discrete-event or cycle based semantics is an ESL method- ogy of some kind.