The book "Model-Driven Architecture in Practice" by Oscar Pastor and Juan Carlos Molina offers a comprehensive analysis and practical guidance on the application of Model-Driven Architecture (MDA) in software development. It combines theoretical foundations based on over ten years of research with practical experiences from the industry. The authors present a software process that is based on model transformation technology and emphasizes the statement "The model is the code." This represents a paradigm shift that allows bridging the gap between the problem domain and the solution domain. The book addresses the essential conceptual primitives that should be present in a system description and demonstrates how UML can be effectively used to represent these fundamental conceptual constructs. It explains which diagrams and modeling constructs are necessary to create a meaningful conceptual schema and how the transformation process between the various domains can be successfully carried out.