The book "Conceptual Modeling of Information Systems" offers a comprehensive analysis of the development and application of conceptual models in information systems. It highlights the historical evolution from the first formal specifications to modern approaches to abstract modeling. The author discusses the fundamental principles behind the creation of precise, abstracted models and demonstrates how these models can serve as a foundation for designing various implementations. This work is significant not only for professionals in the field of computer science but also for students and researchers engaged with the theory and practice of information systems. With a clear focus on the evolutionary milestones in modeling, the book provides valuable insights into the development of data models and their practical applications.