Business models - opportunities and risks are the focus of this book. The operator or BOT model for financing public infrastructure facilities is a flexible coverage concept. Many stakeholders are unfamiliar with the terms of business administration and the associated risks. This presentation opens up an understanding of cash flow and its connection to risk management. Initially, it addresses the fundamental relationships of the model, clarifies terminology, and presents characteristics and essential features. The book addresses risk management as an important prerequisite for successful project realization. It outlines the business fundamentals and the various areas of risk management throughout the entire project lifecycle. Practical examples are provided to enhance the understanding of this complex topic.