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The use of routines in the decision-making process of individuals, groups and organizations is a well accepted yet taken for granted phenomenon. One goal of organizations is to develop group routines that are efficient, but at the same time flexible. However, this presents a paradox because routines that are efficient at one point in time, or for a particular task, may persist, be unquestioned, and become increasingly inefficient for the group and the organization. This chapter develops a formal theory that describes the processes by which the legitimation of particular group structures impacts the development and use of group routines. The theory presented draws from theories of legitimation, expectation states theory, and institutional theory. The theory formally depicts three sources of legitimation: a referential belief structure (set of cultural beliefs) about expertise and leadership, authorization or superordinate support of a leader, and endorsement (support by group) of a leader. Specifically, the theory addresses: (1) how different sources of legitimation make groups more or less hierarchical; and (2) how the different sources of legitimation make group routines more or less flexible.

Before addressing these three issues, I provide some background on the key theoretical approaches to legitimacy employed in this volume: two legitimacy theories in social psychology and institutional theory in organizational analysis. Virtually every contributor draws upon at least one of these theories; several authors draw upon two of these theories, offering a way to bridge them and/or apply them to a substantive concern.