The Study of Constraints . and advance. the main parameters of gearboxes" under the authorship of a team of authors, including C. A. Makushkina, is an in-depth and comprehensive study focusing on one of the key topics in the field of mechanics and mechanical engineering. This publication will be of particular interest to specialists, engineers and students who seek to deepen their knowledge in the field of design and analysis of gearboxes, as well as to anyone interested in modern technologies in mechanical engineering. Reducers are devices that play an important role in the transmission of mechanical energy, and their proper design and tuning are critical to ensure the efficient operation of various machines and mechanisms. The book discusses the basic design of gearboxes, their parameters and characteristics, as well as methods of their calculation and optimization. The authors share their knowledge and experience, which makes the material accessible and understandable even for those who are just starting their way in this area. The book not only offers theoretical foundations, but also includes practical examples, which allows the reader to better understand how to apply the knowledge gained in real conditions. This makes the publication particularly valuable for technical students, as well as for practicing engineers who are looking for new approaches and solutions in their work. The topics covered in the book cover a wide range of issues, including the choice of materials for gearboxes, methods of their diagnosis and maintenance, as well as current trends in the automation and digitalization of design processes. The authors emphasize the importance of accuracy and reliability in the work of gearboxes, which makes this book relevant for everyone who seeks to improve technology and improve the efficiency of production processes. The style of the authors is distinguished by the clarity and accessibility of the presentation, which makes it easy to assimilate even the most complex concepts. They use visual illustrations and diagrams, which makes the material more understandable and visually attractive. In addition, the team of authors includes experienced specialists who have already proven themselves in scientific and practical activities, which adds additional value to this publication. If you are looking for books on the topics of mechanics, machine design, as well as gearboxes, then “Study of structures . and advance. the main parameters of the reducers" will be a great addition to your library. This edition will be useful not only to engineers and students, but also to everyone who is interested in modern technologies in the field of mechanical engineering and wants to expand their knowledge of mechanical systems. In conclusion, the book “Study of structures . and advance. the basic parameters of gearboxes" is not just a training manual, but a real find for everyone who wants to understand the intricacies of gearboxes design and improve their professional skills. This edition will become a reliable assistant on the way to mastery in the field of mechanics and engineering, opening up new horizons and opportunities for the reader.