---
title: "Legacy system migration as a milestone: AI Use Case"
description: "Move off an old system or spreadsheet process onto a supported one, as a fixed-scope milestone with acceptance criteria and a rollback plan."
url: https://lidvizion.ai/use-cases/legacy-system-migration/
site: Lid Vizion
index: https://lidvizion.ai/llms.txt
---

[Use cases](https://lidvizion.ai/use-cases/) · Operations

# Legacy system migration as a milestone

Move off an old system or spreadsheet process onto a supported one, as a fixed-scope milestone with acceptance criteria and a rollback plan.

[Talk through this workflow](https://lidvizion.ai/contact/?need=milestone-delivery&from=%2Fuse-cases%2Flegacy-system-migration%2F#write) · [Milestone & Custom Delivery](https://lidvizion.ai/services/milestone-delivery/)

Where it starts

## The trigger.

A critical process runs on a system that is unsupported, fragile or understood by one person.

How it runs today

- The old system breaks in ways only one person can fix.
- Data lives in formats nothing else can read.
- Every attempt to replace it stalls on scope.

The workflow

## Four bounded steps.

Each step has an owner and a stop rule.

1. 01 / Define
   Agree what must work on day one, and what can wait.
2. 02 / Map
   Document the data, integrations and workflows the old system supports.
3. 03 / Migrate
   Move data and workflows in tested stages, running old and new side by side.
4. 04 / Cut over
   Switch with a rollback plan, then retire the old system once accepted.

Where people stay in control

## Approval points.

- The process owner signs off each stage against the acceptance criteria.
- Cut-over happens only with an approved rollback plan.

How we would measure it

## Against a baseline.

Measured before and after, on the same work.

### Acceptance criteria met at cut-over.

### Incidents in the weeks after cut-over.

### Manual workarounds removed.

Related

## Go deeper.

- [Milestone & Custom Delivery](https://lidvizion.ai/services/milestone-delivery/): When the work is bounded, we can own the delivery directly—from integration and automation through a custom application or migration.
- [Client vs. server: where code runs](https://lidvizion.ai/resources/basics/backend-client-vs-server/): What belongs in the browser or app, and what must stay on a server you control.
- [Plan a legacy system migration](https://lidvizion.ai/guides/plan-a-legacy-system-migration/): A four-step playbook to move off an old system in stages, with the data checked, the business running throughout and a way back if something goes wrong.
- [How to migrate off a legacy system](https://lidvizion.ai/answers/how-to-migrate-off-a-legacy-system/): How can a company replace a legacy system without disrupting the business?

More use cases

## Other places to start.

[All use cases](https://lidvizion.ai/use-cases/)

- [Document intake and review](https://lidvizion.ai/use-cases/document-intake-review/): Operations Pull the fields out of incoming documents, check them against your rules, and route only the exceptions to a person.
- [The weekly status brief](https://lidvizion.ai/use-cases/weekly-status-brief/): Operations Gather updates from approved tools, draft the brief, and flag the items that need a decision.
- [Internal knowledge assistant](https://lidvizion.ai/use-cases/internal-knowledge-assistant/): Operations Answer staff questions from approved policies, procedures and product documents, with the source shown and a clear handoff when the answer is not there.

An illustrative workflow pattern, not a result from a specific customer.

Bring the messy version

## One workflow. A better way to run it.

Show us the tools, the handoffs, and the part that keeps slowing your team down.

[Let’s map your workflow](https://lidvizion.ai/contact/) · [Read our approach](https://lidvizion.ai/approach/)