Head First Object-Oriented Analysis & Design shows you how to analyze, design, and write serious object-oriented software: software that's easy to reuse, maintain, and extend; software that doesn't hurt your head; software that lets you add new features without breaking the old ones. Inside you will learn how to: * Use OO principles like encapsulation and delegation to build applications that are flexible * Apply the Open-Closed Principle (OCP) and the Single Responsibility Principle (SRP) to promote reuse of your code * Leverage the power of design patterns to solve your problems more efficiently * Use UML, use cases, and diagrams to ensure that all stakeholders are communicating clearly to help you deliver the right software that meets everyone's needs.