This special issue focuses upon the creation, maintenance, and use of legitimating ideologies by authorities, institutions, and societies. Such ideologies provide normative justifications for existing policies and practices through which they are seen as appropriate, reasonable, and fair and are, consequently, more readily accepted. KEY WORDS: legitmacy; power; governance; social order.Throughout history social and political commentators have recognized the role of power in creating the ability to rule over others. Those who have power can bribe or coerce others and are able to thereby shape their behavior, giving the powerful the ability to lead groups, organizations, and societies. This is true of political leaders, legal authorities, and the leaders of organizations. A core aspect of social dynamics, therefore, is that power provides a means to shape behavior. The argument that behavior in social settings is linked to the ability to reward and punish is not only central to psychological theories, but is also influential in political science, sociology, and economics, as well as in law, public policy and management.While accepting the realities of power in social life, early social theorists writing as long ago as Aristotle and Plato recognized that seeking to gain influence over others based solely on the possession of power is costly and inefficient. The use of power, particularly coercive power, requires a large expenditure of resources to obtain modest and limited amounts of influence over others. It is therefore important that under some circumstances people are also influenced by others because they believe that the decisions made and rules enacted by others are in some way "right" or "proper" and ought to be followed (Zelditch, 211 0885-7466/05/0900-0211/0 C 2005 Springer Science+Business Media, Inc.