"Critical behavior of non-idealized systems" is a fascinating and deep work of Dmitry Yurievich Ivanov, which immerses the reader in the world of complex systems and their behavior in conditions of uncertainty. This book will be a real find for those who are interested in physics, mathematics, as well as the philosophy of science. In it, the author explores how the non-idealized systems we observe in real life behave in critical situations, and how these behaviors can be described through various scientific approaches. The main theme of the book is critical phenomena that arise in systems that are on the verge of transition from one state to another. Ivanov masterfully explains how even small changes in conditions can lead to significant consequences, which makes his work relevant for understanding not only physical processes, but also social, economic and environmental systems. Readers will be able to learn about how chaos and order coexist in nature, and how this knowledge can be applied in a variety of fields, from biology to economics. The book will be of particular interest to students and graduate students studying physics, mathematics, as well as those working in the field of systems analysis and complex systems theory. However, it is not limited to the academic audience. Fans of scientific literature, who want to expand their horizons and understand how the world around us functions, will find in it a lot of fascinating ideas and concepts. The style of Dmitry Ivanov is clear and logical, which allows even complex scientific concepts to be perceived easily and with interest. He is able to explain complex things in simple language, which makes his books available to a wide audience. If you are familiar with his other works, such as "Complex Systems: From Theory to Practice" or "Chaos Dynamics", then you already know that the author knows how to captivate the reader and make him think about important issues. Topics raised in Critical Behavior of Unidealized Systems range from probability theory to philosophical reflections on the nature of scientific knowledge. Ivanov raises questions about how we can predict the behavior of systems if they do not lend themselves to rigorous mathematical description. He explores the boundaries of scientific knowledge and offers new approaches to understanding complex phenomena, which makes his work relevant and significant in modern scientific discourse. The book also touches on important aspects such as sustainability and adaptation of systems, which can be particularly useful for professionals in the field of ecology and sustainable development. Readers will be able to see how theoretical concepts apply to the real problems facing humanity today. Thus, Critical Behavior of Unidealized Systems is not just a scientific publication, but a real intellectual odyssey that invites the reader to think about the complexities and beauty of our world. If you want to expand your knowledge of complex systems and their behavior, this book will be an indispensable source of inspiration and new ideas for you. Do not miss the opportunity to plunge into the exciting world of science together with Dmitry Yurievich Ivanov!