In the German speaking part of Europe Organizational Communication as we know it from the North American Countries seem to be unknown. A closer look reveals that studies in the research field of Organizational Communication in fact do exist also in German speaking academia but the studies are not usually covered by this term. Since the 1990s the situation has been undergoing a change; Organizational Communication has gradually developed from a discrete into a distinct area of research especially in Communication Studies. Though the concept of Organizational Communication has started to spread in German scientific literature during the last decade, the identity of the field is not quite the same as in the Anglo-Saxon literature. In some cases the term Organizational Communication proves as a simple replacement of Public Relations. In this situation theory may help to strengthen the identity of the field on either side of the Atlantic. Whereas the idea of Communication Constitutes Organization is actually prominent in North America European scholars are deeply influenced by the ideas of Niklas Luhmann who conceives decisions as the typical form of organizational communication. With the help of this theory it is possible to observe both, the inside and the outside of an organization and thereby overcoming the difference between Public Relations and Organizational Communication in favor of an integrated concept of Organizational Communication.