Separation Of Concerns

1 Introduction In 1976, Edsger W. Dijkstra described a technique for problem solving [5, page 211]: "study in depth an aspect of one's subject matter in isolation, for the sake of its own consistency, all the time knowing that one is occupying oneself with only one of the aspects"; he dubbed this technique separation of concerns. It is not easy to decide how a problem should be decomposed into separate concerns, but realizing that a decomposition is needed is an important first step in solving the problem