Modern day projects require software and systems engineers to work together in realizing architectures of large and complex software-intensive systems. This book examines the role of system architecture in software. Explaining the tools used for creating and managing architectures of such systems, the author helps practitioners become more effective in developing large scale software-intensive systems. The text covers the forces that shape this architecture; the role of architectural design patterns and tactics in addressing these forces; techniques, methods and tools for creating, documenting and evaluating an architecture; reusing architectural assets through product lines.