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Many modification tasks on an existing software system result in changes to code that crosscuts the system's structure. Making these changes is difficult because a developer must understand large parts of the system and must reason about how the modification will interact with the existing behaviour. Most of the time, developers attempt to make a change use an ad-hoc process with tools that help in gaining some understanding of the existing system, but which do not provide any specific supportdoi:10.1109/icsm.2002.1167758 dblp:conf/icsm/LaiM02 fatcat:5ru7ytjrenegpfezsa3x5ybbki