The book "Methods of study of correlated flows and special systems of mass service" authored by E. R. Garayshina and his colleagues are a unique publication that immerses the reader in the complex but fascinating world of mass service theory and flow analysis. This work will become an indispensable assistant for students, graduate students, researchers and practitioners working in the field of information technology, telecommunications and system analysis. The book discusses methods to investigate correlated flows, which is an urgent task in today's society, where information and services are transmitted at high speed and in large volumes. The authors offer the reader not only theoretical foundations, but also practical examples that will help to better understand how to apply these methods in real systems. The focus is on special mass service systems that have their own unique characteristics and require a special approach to analysis. Readers interested in topics such as probability theory, statistics, flow management, and process optimization will find many useful ideas and concepts in this book. It will be especially useful for those who are engaged in the design and optimization of systems, where a high degree of reliability and efficiency is important. The book will be an excellent help for specialists in the field of logistics, project management and software development . The topics raised in the book go beyond simple data analysis. The authors discuss the impact of correlated flows on system performance, explore various service models, and propose methods for optimizing them. This makes the book relevant not only for theorists, but also for practitioners who seek to improve the effectiveness of their systems. The reader will be able to learn about current trends in the field of mass service and how new technologies can change approaches to analysis and design. Style and . R. Garayshin and his colleagues are distinguished by clarity and accessibility, which allows even complex concepts to be explained in simple language. The authors use many illustrations and examples, which makes the material more clear and understandable. This is especially important for those who are just beginning their journey in studying the theory of mass service. The book is not overloaded with complex mathematics, which makes it available to a wide audience, including those who do not have in-depth knowledge in this area. In addition, and . R. Garayshin is known for his other work in probability theory and statistics, which adds additional value to his research. Readers familiar with his previous publications will be able to appreciate the consistency and depth of his approach to analyzing complex systems. Thus, “Methods for the study of correlated flows and special mass service systems” is not just a textbook, but a real find for anyone who wants to deepen their knowledge in the field of system analysis and mass service theory. This book will become a reliable guide to the world of complex systems, will help to find answers to current questions and will open new horizons for professional growth. If you are looking for high-quality literature on this topic, which combines theory and practice, then this publication should definitely take a worthy place on your shelf.