The article discusses the role of managerial functions in information systems. It explains the concepts of systems and information, and how they are related in information systems. The paper describes the different elements of information processes, such as storage, retrieval, decision making, and controlling. It also analyzes the responsibilities and roles of the components in information systems. The main finding is that information systems consist of three main sub-systems: management information, operation information, and system design information. These sub-systems work together to form a unified complex whole in an information system.