Abstract
Irrationality is a basic feature of organizational behaviour. Organizational decision making tends to be irrational, and organizational ideologies bias organizations’ perceptions. Much effort has been spent on prescribing how organizations should achieve more rationality. However, rational decision making affords a bad basis for action. Some irrationalities are necessary requirements for organizational actions. Choices are facilitated by narrow and clear organizational ideologies, and actions are facilitated by irrational decision-making procedures which maximize motivation and commitment.