This document provides an overview of Object Oriented Analysis and Design (OOAD) principles, highlighting key concepts such as object basics, state and properties, behavior and methods, encapsulation, class hierarchy, and relationships among objects. It emphasizes the importance of a dynamic and adaptable software development life cycle, alongside the utility of Unified Modeling Language (UML) for effective design. The document serves as a guide for understanding the fundamental aspects of OOAD in software development.