This paper focuses on two interrelated research questions. First, an analysis of managerial decision-making is incorporated into shareholder and stakeholder theory. Secondly, the paper investigates what consequences result for management accounting from inherent conceptions of managerial decision-making behavior. These research questions are based on assumptions of complex interrelationships among decision-making managers, management accountants, and techniques they employ. The findings of this research support that tenets of management accounting systems correspond best with shareholder theory. In doing so they apply financial measures, pursue the goal of profit maximization, and focus on decision-making behavior resulting from the agency relationship between shareholder and manager. Stakeholder theory, however, is fundamentally different from shareholder theory in terms of goals, management philosophy, relationships, behavioral assumptions etc. For these reasons differences with respect to managerial decision-making behavior are reasonable and different requirements related to management accounting systems appear appropriate.