The low level of knowledge and awareness of the benefits of organizational management systems is one of the main causes of the low level of implementation of management systems in organizations in the Republic of Croatia. The absence of standardized management systems that include tools for risk analysis, risk mitigation and many other guidelines issued by internationally recognized management systems can have a significant adverse effect on the business and life cycle of organizations, regardless of the size, structure or ownership of the organization. Globalization, market and maritime development, and the increasing pace of business processes in organizations, require standardization and standardization, and put it at the forefront of every serious organization today. Compared to developed economies, the level of implementation of standardized and internationally recognized management systems in our country is very low. The aim of this course is to increase the awareness and knowledge of students, especially those who will participate in the work of maritime organizations, and especially those who will have an inspection function. he management system implemented in the maritime organization provides a working framework within which to achieve the desired results of the maritime organization observed in an efficient and effective manner. In other words, the management system is “the way we want the business to be done.” A system is a set of elements that are interconnected and that work together. The management system is a documented and tested step-by-step method that focuses on the functioning of the organization through standard practices. A management system is a system by which the established policies and goals of the organization achieve those goals. The goal of each administration is to set up an organization where everyone knows exactly what, who, when, how and where to do in order to achieve the plan. Management systems are models that help organizations manage their work. There is a wide range of different management systems covering different areas of activity. Management systems in organizations can be implemented and maintained individually, however, the use of integrated management systems is increasing. An integrated management system is a set of two or more different individual management systems integrated into one mutually harmonized management system. Increasing the implementation of integrated management systems in organizations indicates that organizations are recognizing the benefits of integrated management systems. The most common examples of integrated management systems implemented are related to quality management systems, environmental protection, safety and health protection. System theory is the science that deals with the study of systems and the laws that govern them. It emerged from the need to find such scientific and practical methods by which to analyze and solve problems scientifically, where traditional and common methods developed in other scientific fields do not give satisfactory results. Its starting point is that in all areas there are phenomena that can be considered systems, that is, in them there are specific systemic laws whose knowledge allows us to understand the phenomenon itself, its content and behavior. Applying this knowledge to a wide variety of areas of human activity brings about the solution of scientific and practical problems. It was created with the aim of creating a general theory that would cover the study of systemic phenomena, ie all typical systemic properties and apply to all systems, regardless of their nature (interdisciplinarity – preventing the fragmentation of science into all narrower disciplines). American biologist Ludwig von Bertalanffy1, in 1954 founded the “Society for General Theory of Systems”. This is considered to be the foundation of system theory, that is, the system as a scientific discipline. Its subject is: problems that cannot be isolated and isolated from their environment and subjected to controlled influences, problems of different heterogeneous areas (cannot be fully viewed from the standpoint of a scientific discipline), and those that occur in complex dynamic systems and cannot be understood and analyze from a single point of view. Its goal is to view and simplify very complex and complicated phenomena and make expert observation and practical solution available. This book deals with the following topics: General system theory, observational, analytical and systematic methods, basic system characteristics, system types and systems division, systematic approach, systematic analysis, heuristics, systematicity, black box method, systemic levels, symbolic and graphical representation systems, formalization of system structure, formalization of system behavior, time relations in the system, network methods, modeling and simulation, system management, chaos theory, system dynamics, operational research.