Object-Oriented Modeling and Design is a book that teaches a new way to develop software using object-oriented technology. It focuses on understanding requirements, creating clean designs, and building systems that are easy to maintain. The book emphasizes high-level analysis and design processes, rather than just programming. It covers the entire software development cycle, from analysis to implementation, using graphical notation that is not tied to any specific programming language. The authors provide case studies of real-world applications and include examples and exercises to help readers understand the concepts and methodology.