A practical method
A four-part method the team can test
Try this method on a representative slice of this data change before changing every team or record. Each part of the planning CRM cutover trial should leave evidence that another person can inspect, challenge and repeat.
1. Inventory before moving
Count records, fields, relationships, owners, activities and attachments. Mark obsolete, duplicated and sensitive material for a separate decision; keep the practical aim in view: coordinate the final source freeze, delta handling, verification, communications and decision to proceed.
2. Map meaning, not labels
For every required value, document its source meaning, destination field, transformation, permitted values and deliberate exclusions; keep the practical aim in view: coordinate the final source freeze, delta handling, verification, communications and decision to proceed.
3. Run a representative trial
Use ordinary records plus missing values, duplicates, long histories and unusual characters. Keep the trial reversible and isolated from live communication; keep the practical aim in view: coordinate the final source freeze, delta handling, verification, communications and decision to proceed.
4. Reconcile and sign off
Compare source and destination counts, relationships and samples. Log every variance, owner and acceptance decision before cutover; keep the practical aim in view: coordinate the final source freeze, delta handling, verification, communications and decision to proceed.