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Object-oriented analysis and design (OOAD) is a software development approach that involves analyzing and designing software systems using object-oriented concepts. OOAD involves identifying the objects and classes that make up a system, and defining their properties and behavior.

Even if you obtain the PDF legally, reading alone changes nothing. Weisfeld emphasizes "the thought process" requires deliberate practice.

: Detailed explanations of Encapsulation (hiding data), Inheritance (reusing class definitions), Polymorphism (responding to the same message in different ways), and Abstraction (focusing on essential features).