Playbook for Using AI for Legacy Modernization

AI can accelerate legacy code rewrites, but successful modernization starts with understanding what needs to change. Explore Gartner guidance on aligning existing software behavior with future business needs before generating new code.

What to consider before rewriting legacy code with AI

AI can help teams rewrite legacy code faster, but speed alone doesn't guarantee better software. Without a clear understanding of how existing applications work and what they need to accomplish in the future, organizations risk recreating the same problems in a new codebase.

In Playbook for Using AI for Legacy Software Modernization, Gartner explores why software engineering leaders must look beyond code generation and take a more deliberate approach to legacy modernization.

Read the report to learn:

  • Why understanding existing application behavior is essential before rewriting code
  • How aligning current functionality with future business needs can guide modernization decisions
  • Why AI-assisted code generation should support modernization goals, not define them

Gartner, Playbook for Using AI for Legacy Software Modernization, Howard Dodd, 9 September 2026.

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