This chapter gives an introduction to the book content. It highlights the importance of well-formulated requirements in various aspects of life, particularly focusing on IT. The chapter emphasizes the significance of requirements engineering in achieving successful IT projects and highlights the roles of different professionals, such as project managers, UI designers, and IT experts, in this process. It also presents an example of an insurance company undergoing a transformation to improve its customer service processes through agile methodologies and modern IT solutions. The protagonists, Linda and Jan, are introduced as they work together to address the challenges and implement effective requirements engineering practices. The chapter concludes by outlining the structure of the book and the roadmap for the case study.