This book is an introduction to the art of systems thinking, a discussion of the principles and methods of holistic understanding of complex systems, about properties and behaviors determined by the nature of connections between their components and the representations of the people involved. The authors achieved an unusual combination of imagery and depth by describing problem situations using causal loops—chains of reinforcing and balancing feedback. This approach gives the reader a unique opportunity to simultaneously use their abilities for imaginative perception and logical thinking to find extraordinary creative solutions. The book is written in a simple, clear language, making it accessible to a wide range of readers. It will help students, young scientists, and specialists form and develop a systemic worldview. For professionals—scientists and managers involved in solving socio-political, economic, managerial, psychological, ecological, and other complex problems—the book provides a powerful tool for conceptual modeling. It can become the basis for breakthrough solutions in any field.