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Modernizing Legacy Software: Rewrite vs Refactor Decision Matrix

How to evaluate legacy applications. Decide when to refactor existing codebases versus when to execute complete system rewrites.

Updating Legacy IT Foundations

Legacy software can restrict business agility, increase hosting costs, and create security vulnerabilities. Decide whether to rewrite or refactor.

Decision Variables

  • Refactoring: Clean up and optimize existing codebases without changing core functionality. Best for stable systems with minor bottlenecks.
  • System Rewrite: Rebuild applications using modern technologies. Best for legacy systems that restrict feature development or carry high hosting costs.

A structured evaluation matrix helps engineering teams modernize legacy platforms safely.

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