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Architecture Description Languages (ADLs) provide an abstract representation of software systems. Achieving a concrete mapping of such representation into the implementation is one of the principal aspects of MDA (Model Driven Architecture). Integration of ADLs within MDA confers to the MDA platform a higher level of abstraction and a degree of reuse of ADLs. Indeed they have significantly different platform metamodels which make the definition of mapping rules complex. This complexity is clearly noticeable when some software architecture concepts cannot be easily mapped to MDA platform. In this research, we propose to integrate software architecture within MDA. We define also strategy for direct transformation using a UML profile. It represents both software architecture model (PIM) and MDA platform model (PSM) in UML meta-model then elaborates transformation rules between results UML meta-models. The goal is to automate the process of deriving implementation platform from software concepts. Key words: Software architecture, COSA, MDA, UML profile, mapping rules, INTRODUCTION Software architecture description provides an abstract representation of components and their interactions of a software system by means of Architecture Description Languages (ADLs) (7). This technique is called Component-Based [...]