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With object-oriented modeling language many programers and methodologists had improved and suggested various methodology on object-oriented analysis and design from mid 70's to 80's. Especially, UML(Unified Modeling Language), which was certified as a standard by OMG(Object Management Group) in 1997, has been proved to be efficient in modeling large-scaled and complicated system.In this paper, through object-oriented analysis and design which is based on UML, I will implement an e-Commerce system in the 3-tiers environment of Supplier-Head Office-Agency.