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Defining what constitutes a service when building service-orientated applications seems to be a common problem for developers and architects who are new to building services. The main issue seems to be the scope, i.e. what is the granularity of the service. This is actually quite difficult since the granularity of a service can vary depending on the application. The trick with any fuzzy problem is to break it into smaller pieces. There is a very simple service taxonomy defined in Thomas Erls SOA in Principals of Service Design book which I believe makes the approach to defining services much easier. (more…)