The book "Formal Methods for Components and Objects" offers a comprehensive analysis of the application of formal methods in software development, particularly in the context of component-based and object-oriented systems. It is based on the revised presentations of leading researchers that were presented at the 5th International Symposium on Formal Methods for Components and Objects in Amsterdam. The contributions in this volume cover a wide range of topics relevant to the development of large software systems and emphasize the necessity of specification, modeling, and validation techniques that support reusability and modifiability. The organization of the articles into thematic sections allows readers to specifically access relevant aspects of formal methods and their application in software engineering.