What leaders see
Packaged tools do not fit the required work.
Teams rely on workarounds because standard products cannot represent a critical workflow, rule, interface, or decision.
Services
Legacy Modernization · Parallel Running
Parallel Running
Prove the replacement against live manufacturing work before cutover. For critical ERP and custom systems, parallel running compares old and new results across orders, inventory, production, financial postings, interfaces, and exceptions. Cutover follows defined reconciliation thresholds and accountable approval, not confidence alone.
01
The Problem
The replacement has been tested, but it has not reproduced the manufacturing results the business depends on.
Custom-software problems begin when the operation has a real capability gap but has not separated what should be configured, integrated, modernized, purchased, or deliberately owned in code.
What is actually happening
The durable requirement is not isolated.
Business rules, legacy dependencies, integration boundaries, user needs, and support ownership remain mixed together.
What gets worse
Every workaround becomes a software dependency.
Uncontrolled customizations accumulate without architecture, testing, documentation, or a maintainable change path.
02
What Changes
What Parallel Running includes.
For critical ERP and custom systems, parallel running compares old and new results across orders, inventory, production, financial postings, interfaces, and exceptions. Cutover follows defined reconciliation thresholds and accountable approval, not confidence alone.
01
Dual Processing
Both systems process the same transactions simultaneously. Orders, invoices, inventory movements, and financial postings run through old and new in parallel.
02
Automated Reconciliation
Automated comparison of outputs -- order totals, inventory balances, financial summaries, and report data. Discrepancies flagged immediately for investigation.
03
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?
04
Cutover Criteria
Predefined, measurable criteria for when to cut over -- reconciliation accuracy threshold, exception count, and processing time. No subjective judgment calls.
05
Gradual Transition
Option to transition user groups or business units incrementally. Start with a pilot group before cutting over the entire organization.
06
Rollback Readiness
Legacy system remains fully operational throughout parallel running. If the new system isn't ready, you continue on legacy with no disruption.
03
How It Fits Your Operations
How Parallel Running fits your operation.
Custom Software EngineeringWhat gap is worth owning in custom code, what can remain standard, and how the capability will be supported and changed.
Governance dependencyCustom software is warranted only when a documented manufacturing capability cannot be delivered cleanly through existing products, configuration, or a smaller integration.
Capability the operation requires
operating rules
system interfaces
user decisions
exceptions
support and change history
What must be defined before engineering begins
- What the business needs to change and why.
- Which systems, records, risks, and readiness gaps shape the work.
- What should be built, how it fits the architecture, and in what order.
Related Services and Planning
What the operating problem may require next.
Follow the dependencies behind this service instead of treating it as an isolated project.
01
Integration Engineering
Connect the new or modernized capability to the operating environment around it.
Explore next step02
Workflow and Exception Automation
Define the actions, approvals, exceptions, and ownership the software must support.
Explore next step03
Operational Analytics
Make adoption, operating performance, and exceptions measurable after delivery.
Explore next step04
Launchpad assessment and Roadmap
Use Launchpad when the operating problem needs a structured assessment, readiness evidence, architecture, and implementation Roadmap.
Explore next stepStart With the Operating Problem
Define the smallest sound response and delivery sequence.
Metrotechs determines what the operation actually requires before selecting technology. When a structured assessment is warranted, Launchpad turns evidence into priorities, risks, architecture, and an implementation Roadmap.
Metrotechs designs, builds, integrates, and supports the approved solution.
Launchpad is available when the engagement needs assessment evidence, a Roadmap, and ongoing delivery governance.
04
Delivery sequence
How Metrotechs delivers Parallel Running.
For critical ERP and custom systems, parallel running compares old and new results across orders, inventory, production, financial postings, interfaces, and exceptions. Cutover.
01
Parallel Plan
Define which processes run in parallel, how long, and what success looks like. Identify the reconciliation points and acceptable variance thresholds.
02
Reconciliation Setup
Build automated reconciliation scripts that compare outputs between old and new systems. Define exception categories and escalation procedures.
03
Parallel Execution
Run both systems in parallel for the defined period. Monitor reconciliation results daily and investigate exceptions.
04
Exception Resolution
Diagnose and fix discrepancies -- configuration adjustments, data corrections, or code fixes in the new system.
05
Cutover Decision
When reconciliation meets the defined criteria, execute the cutover. Keep legacy in read-only mode for the defined safety period.
05
FAQ
Questions that usually decide the scope.
Straight answers to what operators ask before committing budget to this work.
Typically 2-4 weeks for transactional processes and one full month-end close cycle for financial processes. The duration depends on transaction volume and complexity -- you need enough data to be statistically confident.