The book "Investigation of Operations" by Ventzel E. C. is a deep dive into the world of mathematical modeling and optimization, which finds application in a wide variety of fields - from economics and management to engineering and logistics. This publication will be an indispensable assistant for students, graduate students and professionals seeking to master decision-making methods in conditions of uncertainty and limited resources. The book focuses on the basic concepts and methods of operations research, which allow analyzing complex systems and finding optimal solutions for various tasks. Wentzel, known for his in-depth knowledge of mathematical statistics and probability theory, offers readers not only theoretical foundations, but also practical examples, which makes the material accessible and understandable. The book covers a wide range of topics, including linear programming, game theory, network planning, and many other techniques that help effectively solve optimization problems. For whom is this book intended? First of all, it will be useful for students of technical and economic specialties who study disciplines related to mathematical modeling and optimization . It will also attract the attention of graduate students and young scientists who want to deepen their knowledge in the field of operations research. Practitioners in the field of project management, logistics and business analysis will find in it valuable tools for improving the efficiency of their work. Topics raised in Operations Research range from theoretical foundations to practical applications, making the book relevant and multifaceted. Wentzel emphasizes the importance of making informed decisions in an uncertain world, especially in today’s world, where data and information are becoming key resources. Readers will be able to learn how different methods of operations research can help in optimizing processes, increasing productivity and reducing costs. Wentzel's style is distinguished by clarity and logical presentation, which makes it easy to assimilate even the most complex concepts. The author masterfully combines theory with practice, offering readers not only formulas and algorithms, but also real examples from life, which makes the material more lively and interesting. His other well-known works are also devoted to mathematical methods and their application in various fields, which confirms his status as an expert in this field. The book “Operations Research” is not just a textbook, but a real find for everyone who wants to learn how to effectively solve problems using modern methods of analysis and optimization. It will be your reliable companion in the study of complex systems and will help you develop the critical thinking necessary for a successful career in any field related to data analysis and decision-making. If you are looking for literature that will help you master the methods of operations research, as well as deepen your knowledge in mathematical modeling, then Wentzel’s book is exactly what you need. Do not miss the opportunity to discover a world where mathematics and practice intersect, creating new horizons for your professional growth.