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SOA builds on top of component-based systems, instead of replacing. Just like components allowed OOP to build more complex systems, SOA provides mechanisms for dealing with the ever-increasing complexity that is software development. We haven't forgotten what we learned when we added O-O to our tool belt, and we will continue to create objects and components.
But now it is time to add services to our development toolkit. When we need to describe something by what it is or what it contains, we create a component. Other times it is more natural to describe something by what it does. In this case we create a service.
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