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Service Oriented Architecture: A Design Style

Service oriented Architectures (SOA) and Web Services have been widely discussed in the recent past. Often these two terms are used interchangeably to describe how IT systems are designed using a service oriented model. Many people may not see the distinction between Web Services and SOA, nor realize that SOA is not dependent on Web Services. Service oriented architecture has existed for years without using Web Services technologies. Organizations have implemented systems based on the SOA design style using data warehousing, message oriented middleware and distributed object technologies, well before the advent of Web Services. This paper intends to provide a basic introduction to the SOA style of design by defining the term, tracing its origins, and offering insight to the benefits of this design style. We will then examine three distinct technologies and how the SOA style of design can be used when implementing a solution. During the examination we will identify the strengths and limitations of each technology and offer alternatives to compensate for the limitations. We will conclude by offing some final thoughts, areas of further research and the future of this design style.