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Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior. Its heart is a series of small behavior preserving transformations. Each transformation (called a 'refactoring') does little, but a sequence of transformations can produce a significant restructuring. Since each refactoring is small, it's less likely to go wrong. The system is also kept fully working after each small refactoring, reducing the chances that a system can get seriously broken during the restructuring. This site is a simple portal for information about refactoring. There is a list of sources of information about refactoring, including various books that have been written. There is a catalog of common refactorings, mostly taken from the original book. Many refactorings can be automated, and various tools exist to help the refactoring process. If you want to ask more questions try the mailing list. When new information appears, I update this page and the Atom feed.