Our goals for the first edition were threefold. First, we wanted to show through authentic case studies actual examples of software architectures solving real-world problems. Second, we wanted to establish and show the strong connection between an architecture and an organization’s business goals. And third, we wanted to explain the importance of software architecture in achieving the quality goals for a system.
Our goals for this second edition are the same, but the passage of time since the writing of the first edition has brought new developments in the field and new understanding of the important underpinnings of software architecture. We reflect the new developments with new case studies and the new understanding both through new chapters and through additions to and elaboration of the existing chapters.
Architecture analysis, design, reconstruction, and documentation have all had major developments since the first edition. Architecture analysis has developed into a mature field with industrial-strength methods. This is reflected by a new chapter about the architecture tradeoff analysis method (ATAM). The ATAM has been adopted by industrial organizations as a technique for evaluating their software architectures.
Architecture design has also had major developments since the first edition. The capturing of quality requirements, the achievement of those requirements through small-scale and large-scale architectural approaches (tactics and patterns, respectively), and a design method that reflects knowledge of how to achieve qualities are all captured in various chapters. Three new chapters treat understanding quality requirements, achieving qualities, and the attribute driven design (ADD) method, respectively.
Architecture reconstruction or reverse engineering is an essential activity for capturing undocumented architectures. It can be used as a portion of a design project, an analysis project, or to provide input into a decision process to determine what to use as a basis for reconstructing an existing system. In the first edition, we briefly mentioned a tool set (Dali) and its uses in the re-engineering context; in in this edition the topic merits its own chapter.
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