The book “Investigation of Operations” by Evgeny Semyonovich Ventzel is an outstanding work that immerses the reader in the world of mathematical modeling and optimization. This work, written in an accessible and engaging way, offers not only theoretical foundations but also practical applications of operations research methods, making it an indispensable tool for students, graduate students and practitioners in management, economics and engineering. The book focuses on the concept of operations research as a science that helps to make informed decisions in conditions of uncertainty and limited resources. Wentzel masterfully demonstrates how mathematical models can solve complex problems related to resource allocation, production process planning, logistics and many other aspects that are important in the modern world. The reader will learn about various optimization techniques, such as linear programming, dynamic programming and game theory, which help to find the best solutions in a wide variety of situations. This book will be interesting not only for students and teachers, but also for professionals working in the field of management, logistics and economics. It will be an excellent assistant for those who seek to improve their decision-making skills and learn how to effectively use resources. Wentzel appeals to the reader with the understanding that many of them may be far from mathematics, so he seeks to explain complex concepts in a simple and understandable language, which makes the material available to a wide audience. The topics raised in the book cover a wide range of issues, from the foundations of probability theory and statistics to complex models applied in real business situations. Wentzel focuses on the practical relevance of operations research methods, showing how they can be used to optimize processes in industries ranging from manufacturing to finance. This makes the book not only a theoretical manual, but also a practical guide that can be used in everyday professional activities. Ventzel's style is clear and logical, which allows the reader to easily assimilate even the most complex concepts. His ability to relate theory to practice and to give real-world examples makes the book particularly valuable. Wentzel is the author of several other well-known papers in mathematics and its applications, and his experience and authority in the field add value to Operations Research. If you are looking for a book that will help you understand the complex issues of optimization and decision-making, as well as expand your knowledge in the field of mathematical modeling, “Operations Research” will become your reliable companion. This book will not only enrich your arsenal of knowledge, but also inspire new ideas and approaches in your professional activities. Thus, “Operations Research” is not just a textbook, but a real find for everyone who seeks to understand how to effectively solve problems in conditions of limited resources. Read, learn and apply your knowledge in practice, and you will see how your understanding of the world of business and management will become deeper and more meaningful.