Migration Strategy

Plan phased migrations that minimize risk and disruption while delivering value incrementally.

Instructions

1. Assess Current State: What's working? What's broken?
2. Define Target State: New architecture vision
3. Identify Seams: Where can you break the system into phases?
4. Plan Phases: Each phase delivers value; takes weeks to months
5. Risk Mitigation: Parallel running, feature flags, rollback plans
6. Success Metrics: How do we measure success of each phase?

Anti-Patterns

• Big Bang Rewrite: Replace everything at once. Result: chaos and failure. Guard: Incremental, staged migration.
• No Parallel Running: Migrate directly without validation. Guard: Run old and new in parallel, validate.

Further Reading