Throughout its existence, a company constantly assumes three fundamental hypostases: first of all, the company is a microeconomic system whose function-goal is to produce performance by pursuing economic objectives; then, the company is an organization, respectively a human community with everything that means this - mentalities, traditions and common values, informal communication, antipathies and sympathies, conflicts, struggle for power, etc .; Finally, the company is a dynamic entity, which changes and adapts, according to the variations that take place in its environment, in order to survive and develop. The three avatars of the company are inextricably linked and intertwined to such an extent that the understanding of each of them is possible only by exploring the other two. This conclusion is of utmost importance for managerial activity. The three perspectives on the company - "machinery" generating economic results, human community and evolutionary organism - lead us to believe that the management of the company is not only a strictly economic management, but also an organizational management and, at the same time, a development management. The management of the company is all three aspects simultaneously, without any discrimination, without any hierarchy, without any order of priority. Of course, if he wants to be efficient and professional. The stated optics summarize the central mission of the modern management of the company - the task of the management is to create and maintain a competitive company, able to produce results in the context of a fluctuating and complex environment. Fulfilling this mission is by no means possible if the emphasis is only on one of the three dimensions reported, usually on economic management, the other two being ignored. The success of the managerial activity is conditioned by the harmonious integration of the three sides in the decisions, policies and practices of the company's management. This idea sums up the "red thread" that runs through the entire work. This book was developed for use by students of economics, especially those of the programs "Finance-Banking" and "Accounting and Management Informatics", giving them a systemic conception of the operation and management of modern companies.