A software system comprises multiple views such as analysis, design, implementation, deployment, structure, behavior, input data, and output data views. The non-architectural approach respectively picks a model for each view. The architectural approach, instead of using many heterogeneous and unrelated models, integrates all these multiple views into a single coalescence model of software architecture. Since structure view and behavior view are the two most prominent ones among multiple views, integrating structure and behavior views is a method for integrating multiple views of a software system. In other words, structure-behavior coalescence (SBC) results in the multiple view coalescence (MVC). In such a situation, SBC becomes a synonym of the software architecture. Software architecture the rationale is on the rise and architecture-oriented system analysis and design (AOSA&D) is one of its numerous applications. By this book's penetrating introduction and elaboration, all readers may understand distinctly how to use the SBC software architecture approach to carry on the system analysis and design effectively.