Don’t start with a full replacement
Legacy software can be difficult to work with, but it often contains years of business rules nobody has documented. Before deciding to rebuild, map the critical daily tasks, data sources, dependencies and the cost of an interruption.
Build the migration around real workflows
- Discover and agree scope. Identify the highest-value tasks, people who depend on them, and what an acceptable result looks like.
- Prepare the data. Check duplicates, missing fields, ownership and how records will move safely.
- Run representative tests. Validate real-world scenarios with staff, including unusual records and error conditions.
- Stage the cutover. Consider parallel operation, monitoring, backups and a rollback path, appropriate to the system’s constraints.
A staged migration can reduce risk, but it is not a promise of uninterrupted operation. Ask vendors to specify recovery responsibilities and acceptable downtime, if any, before work begins.
Keep people in the loop
Automation should remove repetitive effort while preserving review points where human judgment matters. Train the team, document changed steps and define post-launch ownership.
A useful first deliverable
For uncertain or business-critical systems, begin with a paid discovery and migration plan. That can be considerably less risky than committing to an undefined development project.