Strategic management is ultimately concerned with the quest for sustainable advantage. To be practical, advantage for commercial firms concerns earnings and sustainable means a concern with earnings into the future. Pearce and Robinson define strategic management as a set of decisions and actions that results in the formulation and implementation of plans designed to achieve a company’s objectives. David says that strategic management can be defined as the art and science of formulating, implementing, and evaluating cross-functional decisions that enable an organization to achieve its objectives. Strategy is also hierarchical concept – it takes place at three different levels: corporate, business, and functional. These levels correspond with the activities of managers in different parts of the organization.