The book is devoted to the description of the basics of the mathematical theory of management of organizational systems. Its purpose is to show the possibility and feasibility of using mathematical models to improve the efficiency of organizations (enterprises, institutions, firms, etc.) d. ). More than forty typical mechanisms are described - management decision-making procedures (implementing the functions of planning, organization, stimulation and control): management of the composition and structure of organizational systems, institutional, motivational and information management. Their totality can be considered as a "constructor", the elements of which allow you to create an effective management system for the organization.