In this paper we examine the definition of the term “feature”, and “functional feature” in particular. The goal of the paper is to shed some light on the reason for the profusion of types of features that have been discussed in the literature, to revisit the general definition of the term, and to attempt a definition that uses concepts from Artificial Intelligence. By separating structure, behavior and function, and by defining function, alternative interpretations of “functional feature” are obtained.

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