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The term ''feature'' is used to denote an unit of functionality. Similar to many concepts in computer science, the term can be used at different levels of abstraction. For example, the plain old telephone service (POTS) is a telephony feature at one level, but itself is composed of originating features and terminating features. The originating features may in turn include the provide dial tone feature, digit collection feature and so on.
This definition of ''feature interaction'' allows one to focus on only certain properties of the interacting features such as how their
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