Prove the new system works before you switch.
The scariest moment in any migration is the cutover. We eliminate that fear by running old and new systems in parallel with automated reconciliation — you switch over only when the new system has proven it produces the same results as the old one.
Cutovers Based on Trust Instead of Proof
- →Go-live decisions based on testing scenarios that don't cover real-world complexity
- →No way to verify that the new system produces the same financial results as the old one
- →Edge cases and exceptions that testing missed surface in the first week of production
- →Once the legacy system is turned off, there's no going back — even if the new system has issues
Parallel Running
Dual Processing
Both systems process the same transactions simultaneously. Orders, invoices, inventory movements, and financial postings run through old and new in parallel.
Automated Reconciliation
Automated comparison of outputs — order totals, inventory balances, financial summaries, and report data. Discrepancies flagged immediately for investigation.
Exception Reporting
Detailed reports on every discrepancy between old and new systems. Root cause analysis for each exception — is it a bug, a data issue, or a business rule difference?
Cutover Criteria
Predefined, measurable criteria for when to cut over — reconciliation accuracy threshold, exception count, and processing time. No subjective judgment calls.
Gradual Transition
Option to transition user groups or business units incrementally. Start with a pilot group before cutting over the entire organization.
Rollback Readiness
Legacy system remains fully operational throughout parallel running. If the new system isn't ready, you continue on legacy with no disruption.
The Engagement Process
Parallel Plan
Define which processes run in parallel, how long, and what success looks like. Identify the reconciliation points and acceptable variance thresholds.
Reconciliation Setup
Build automated reconciliation scripts that compare outputs between old and new systems. Define exception categories and escalation procedures.
Parallel Execution
Run both systems in parallel for the defined period. Monitor reconciliation results daily and investigate exceptions.
Exception Resolution
Diagnose and fix discrepancies — configuration adjustments, data corrections, or code fixes in the new system.
Cutover Decision
When reconciliation meets the defined criteria, execute the cutover. Keep legacy in read-only mode for the defined safety period.
Frequently Asked Questions
Legacy Modernization · Parallel Running
Every engagement starts with an assessment.
We scope work after we understand your operation — not before. The Launchpad assessment maps where you are, quantifies what it's costing you, and sequences what to do first.
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