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Legacy systems are vital to an organization, and sometimes form the backbone of an organization, yet their maintenance and evolution had been an area of research for a long time. Besides being costly to maintain, legacy systems often lag behind changes in the businesses they support. The challenge in today's environment is to keep evolving the older systems so that they are compatible with the real world technological environment. The most common approach was to migrate the legacy code to object oriented code. However, there are many other paradigms that a legacy system might adopt. Aspect-oriented technology is another emerging programming paradigm that is receiving considerable attention from research and practitioner communities alike.
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