In a world of societies ever more closely interrelating to each other, lawyers face the challenge of crossing the borders of their national legal system and looking beyond its fundamental source of identity – the constitution. Having this thought in mind, Harald Eberhard, Konrad Lachmayer and Gerhard Thallinger organized the First Vienna Workshop on International Constitutional Law held on 20 and 21 May 2005, bringing together members of the academic community, legal officers in International Organizations and law students. The Workshop offered eight lectures and fruitful discussions on the comparative analysis of constitutional law thus providing a new impetus to a field of law of steadily growing importance to which, so far, too little attention has been given.