Service-oriented architecture(SOA) is a paradigm where reusable units are independently executable and only accessible through outer interfaces. Standardized methodology based on SOA has not been decided yet although a lot of efforts have been made for systems using SOA. Therefore Development of system using SOA is facing many difficulties currently. In this paper, service oriented methodology of function based model for supporting legacy system is proposed. Standardized methods for function based reusability through analysing SOA methodology are proposed and guide lines for improvement of service reusability are presented.
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