Object-Oriented Analysis and Design promotes better understanding of the requirements, cleaner designs and more maintainable systems. This learning material emphasizes that object oriented technology is more than just a way of programming. It applies the object-oriented concepts to the entire software development cycle. The significant features of this learning material are: *It focuses on the conceptual processes of analysis and design, rather than the low level, back-end implementation steps of programming, *It helps to learn system analysis and design technique - what it is and how one goes about doing it, *It makes us understand and appreciate that we live in a world of systems and systems within systems, which are parts of even larger systems, *It presents graphical notations and methodologies independent of any particular programming language, *It provides a detailed description of the concepts in Object Modeling, *It provides a clear discussion on the important modeling diagrams used in object oriented analysis and design, *It contains case studies of real world object oriented applications, *It offers extensive examples and exercises to assist students in their course work, *It provides a clear description on the views and models used in UML, *It also provides a discussion on other OOAD methodologies like Booch, OMT, OOSE, Shlaer/ Mellor and Coad / Yourdon.