Contemporary SOA is an evolution
SOA defines an architecture that is related to but still distinct from its predecessors. Itdiffers from traditional client-server and distributed environments in that it is heavily influenced by the concepts and principles associated with service-orientation and Web services. It is similar to previous platforms in that it preserves the successful characteristics of its predecessors and builds upon them with distinct design patterns and a new technology set.
For example, SOA supports and promotes reuse, as well as the componentization and distribution of application logic. These and other established design principles that are commonplace in traditional distributed environments are still very much a part of SOA.
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