in 1992 . This approach fundamentally changed software development by introducing to connect user requirements directly to system design. 1. Key Principles of the Methodology

Addison-Wesley (the publisher) has not kept Object-Oriented Software Engineering in heavy print circulation for decades. Because the book is out-of-print in many regions, developers assume it has entered the public domain (which it has not). Consequently, GitHub becomes a hive for sharing "abandoned" technical books.

by Ivar Jacobson on GitHub typically leads to repositories containing study notes, course materials, or mirrors of the text. Core Concepts of the Book