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The proliferation of software technology and availability of COTS for just-in-time software development has given a new dimension to software development known as component based software system (CBSS). For quality software it is highly important to analyze risks and quality at software architecture level. In the paper, a unitary system methodology for structural (architecture) modeling and analysis of CBSS is discussed that describes the characteristics of quality such as performance,reliability, functionality, dependability etc. The software can be build faster by integrating selected COTS as per requirement. This paper presents a framework based on graph theory and systems engineering approach to model and analyze component based software system at the architectural level.