System Theory and System Analysis, edited by H. A. Sergeeva is an important work that immerses the reader in the world of a systematic approach to the analysis and design of complex objects and processes. This collective work, created by a group of experts in the field of systems analysis, is not only a training manual, but also a practical guide for professionals seeking to understand more deeply the principles of the functioning of systems in various fields. Systems analysis is a methodology that allows you to consider objects and processes as holistic systems consisting of interrelated components. The book explores in detail key concepts such as the structure of a system, its dynamics, the interaction of components, and the influence of the external environment. The reader will be able to learn how to apply a systematic approach to solve complex problems in areas such as economics, management, ecology and engineering. This book will be of particular interest to students and graduate students of technical and economic specialties, as well as practitioners working in the field of project management, software development and system engineering. It will become an indispensable tool for those who want to master the methods of system analysis and learn how to apply them in practice. In addition, the book will be useful to teachers who are looking for quality materials for courses on systems analysis and systems theory .. The topics raised in the book cover a wide range of issues, from the basics of systems thinking to complex modeling and optimization methods. The authors emphasize the importance of a systems approach in the modern world, where many problems require complex solutions. Readers will be able to see how system analysis helps in decision-making, risk management, and process optimization, making this book relevant to specialists in a wide variety of fields. The style of the authors is distinguished by clarity and accessibility, which makes it easy to assimilate even the most complex concepts. The book is replete with examples from real practice, which makes the material more clear and understandable. In addition, it presents modern methods and tools used in system analysis, which allows the reader to be aware of the latest trends and technologies. N. A. Sergeeva is known for his work in systems analysis and systems theory, and this book is no exception. It continues the tradition of his previous works, such as System Approach in Management and Complex Systems Modeling, and offers readers new ideas and approaches that can be applied to their professional activities. If you are looking for a book that will help you understand complex systems, learn how to apply system analysis in your work and expand your knowledge in this area, Systems Theory and System Analysis will be an excellent choice. It will not only enrich your arsenal of knowledge, but also inspire new ideas and solutions that can change your approach to work and life in general. Do not miss the opportunity to immerse yourself in the world of system analysis and discover new horizons!