The workflow to solve
A migration can meet its record-count target and still produce the wrong business result. The risk lies in relationships: the wrong customer associated with an account, an incorrect product version or a pending order that no longer points to a valid subscription.
A practical software boundary
Define migration checks from the workflows the new system must support. Establish a baseline, account for changes during transfer and record the categories of difference that require review.
What the design should demonstrate
The delivery plan should identify cutover criteria and the owners of unresolved differences. Rehearsing those decisions with representative data gives the final transition a more reliable basis than a successful import alone.
- Reconcile customer, account and subscription relationships.
- Compare product definitions and effective versions.
- Track changes made after the baseline snapshot.
- Agree acceptance and recovery decisions before cutover.