object oriented analysis and design with uml pdf Object-oriented analysis and design OOAD is a technical approach for analyzing and designing an application, system, or business by applying object-oriented programming , as well as using visual modeling throughout the software development process to guide stakeholder communication and product quality. OOAD in modern software engineering is typically conducted in an iterative and incremental way. The intention is for these to be continuously refined and evolved, driven by key factors like risks and business value. In the early days of object-oriented technology before the mids, there were many different competing methodologies for software development and object-oriented modeling , often tied to specific Computer Aided Software Engineering CASE tool vendors.