What problem or claim is examined
A rewrite can silently change calculations, approvals, permissions, reports, or exception handling before the organization notices.
System or demonstration context
A business-critical .NET and SQL system carries behavior across code, stored procedures, forms, reports, jobs, integrations, and operational workarounds.
Source state and inputs
- No client data
- No invented metrics
- Unknown and disputed behavior remain explicit
Method
- Source tracing
- Characterization testing
- Parity scenario catalog
- Old-versus-new comparison
- Domain-owner review
Representative cases
- Inventory system surfaces
- Capture representative scenarios
- Add characterization tests
- Identify reversible seams
- Compare old and new outputs
- Sequence bounded releases
Observed result or demonstration output
Shows how a modernization decision can be made with inspectable behavior evidence rather than rewrite assumptions.
Decision supported
Shows how a modernization decision can be made with inspectable behavior evidence rather than rewrite assumptions.
Artifacts retained
- Current-state architecture
- Business-rule map
- Stored-procedure inventory
- Parity catalog
- Comparison report
- Sequenced roadmap
Limitations and boundary
This is not a named client case study and does not claim that all legacy behavior can be discovered or preserved perfectly.
Boundary statement: This is not a named client case study and does not claim that all legacy behavior can be discovered or preserved perfectly.