Legacy System Modernization: Why a Full Rewrite Is Rarely Your Only Option

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Legacy system modernization covers a broad spectrum of strategies, with a full rewrite being just one extreme option rather than the default solution. The term 'legacy' is best understood not by a system's age but by its inability to be changed safely, a definition drawn from Michael Feathers' concept of code without tests. Most functioning legacy systems can be updated incrementally, moving one capability at a time behind a facade while the original system continues to operate. AWS's 7 Rs migration framework outlines multiple modernization paths, and even AWS advises against refactoring during a migration due to its complexity and cost. Vendors often recommend full replacement because they sell replacement platforms, making it important for decision-makers to understand all available options before committing to a costly rewrite.

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