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In order to satisfy the changing needs of customers and clients, software systems have to be adapted during their whole lifetime. One frequently occurring task is adding a new function to the interface of a (sub-) system. To implement the new functionality, not only the interface has to be extended but several other classes of the (sub-) system. Performing this task manually is tedious and error-prone. In this paper a method is described that simplifies implementing extensions of the above kind. The basic idea is using adaptive programming (AP) , so that new functionality can be described with the help of paths in the class structure and source code transformations.

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