“Diversity refers to any mixture of items characterized by differences and similarities”. (Thomas 1996: 5) This is a definition which had been widely accepted in the U.S.A. and other countries during the 1990s and the beginning 21th century. However, diversity should not be reduced to the level of individuals. Instead, intergroup interaction and power differences must be focused (Prasad/ Pringle/Konrad 2006). Structure and principles of society as the larger system (e.g. power, status and stereotypes related to identity groups) influence processes in the embedded subsystems as teams, departments, corporations or non-business organisations. Context is supposed to cause varied influences of diversity characteristics (Egan/Bendick 2008).