Migration Phases
Phase 1: Audit & Design (2-4 weeks)
Understand old system. Design new system architecture. Plan field mappings.
Phase 2: Data Cleaning (2-4 weeks)
Remove duplicates. Validate fields. Standardize formats. Quality check.
Phase 3: Migration Test (1-2 weeks)
Dry-run migration. Validate data integrity. Fix issues. Repeat until clean.
Phase 4: Production Cutover (1-2 days)
Final migration. Notify teams. Decommission old system. Support go-live.
Phase 5: Stabilization (2-4 weeks)
Monitor for issues. Fix data inconsistencies. Train teams thoroughly.