Textbook in PDF format This book presents the Unified Architecture Process (UAP)—a comprehensive and methodologically rigorous framework designed specifically for addressing the challenges encountered in modern industrial software systems. The book is structured into three main parts. Part I “Overview of Software Architecture” introduces foundational principles and outlines the Unified Architecture Process (UAP) as the core methodological framework. Part II “Guidelines for the Unified Architecture Process” provides detailed instructions for implementing each UAP activity, step, and task, supported by rationales, templates, examples, and checklists. Each chapter in this part corresponds to a specific activity defined in the UAP, and the chapter titles are aligned with the activity names specified in the process. Part III “Resources for Software Architecture Design” offers two categories of indispensable resources, including a catalog of over 30 representative architecture styles. Software architecture defines the high-level structure of a software system, including its components, their interactions, behaviors, and the principles that guide its design and evolution. It serves as a strategic blueprint for system development and evolution, ensuring adherence to specified quality attributes and alignment with business objectives. Software architecture plays a pivotal role in the development of complex systems. It is widely recognized as one of the most critical, sophisticated, and overarching design artifacts in software development—especially in the context of large-scale or high-assurance systems. With more than 190 illustrative figures, the book delivers practical insights into software architecture design. To facilitate skill development and mastery of the UAP, the text includes 140 carefully crafted exercises, promoting hands-on learning and reinforcing conceptual understanding